The correct answer is Period 3, group 17. The modern periodic table, proposed by Moseley, is arranged based on increasing atomic numbers, which fundamentally determines an element's chemical properties.

The correct answer is Period 3, group 2. The modern periodic table, proposed by Moseley, is arranged based on increasing atomic numbers, which fundamentally determines an element's chemical properties.

The correct answer is 2,8,8,2. Elements are classified into s, p, d, and f blocks based on the subshell their valence electrons occupy, dictating their group properties.

The correct answer is 2,8,7. Elements are classified into s, p, d, and f blocks based on the subshell their valence electrons occupy, dictating their group properties.

The correct answer is 3. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 4. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Na. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is C. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Fluorine. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Cs. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Silicon. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Increases. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Chlorine. Periodic trends like ionization energy, electron affinity, and electronegativity depend on the atomic radius and effective nuclear charge acting on valence electrons.

The correct answer is Electronegativity. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is -328. Periodic trends like ionization energy, electron affinity, and electronegativity depend on the atomic radius and effective nuclear charge acting on valence electrons.

The correct answer is kJ mol⁻¹. Periodic trends like ionization energy, electron affinity, and electronegativity depend on the atomic radius and effective nuclear charge acting on valence electrons.

The correct answer is Increases. In the periodic table, horizontal rows are called periods. Across a period, atomic size generally decreases while ionization energy and electronegativity increase.

The correct answer is kJ mol⁻¹. Periodic trends like ionization energy, electron affinity, and electronegativity depend on the atomic radius and effective nuclear charge acting on valence electrons.

The correct answer is Ionization energy. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Increases. Vertical columns are called groups or families. Down a group, atomic size increases and ionization energy decreases due to the addition of electron shells.

The correct answer is Increases. The modern periodic table, proposed by Moseley, is arranged based on increasing atomic numbers, which fundamentally determines an element's chemical properties.

The correct answer is 154 pm. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Both a and b. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is It decreases in a period. Periodic trends like ionization energy, electron affinity, and electronegativity depend on the atomic radius and effective nuclear charge acting on valence electrons.

The correct answer is Atomic radius. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Ionization energy. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Iodine. Periodic trends like ionization energy, electron affinity, and electronegativity depend on the atomic radius and effective nuclear charge acting on valence electrons.

The correct answer is All of these. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Electronegativity. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Positive. Periodic trends like ionization energy, electron affinity, and electronegativity depend on the atomic radius and effective nuclear charge acting on valence electrons.

The correct answer is No change. Periodic trends like ionization energy, electron affinity, and electronegativity depend on the atomic radius and effective nuclear charge acting on valence electrons.

The correct answer is -349. Periodic trends like ionization energy, electron affinity, and electronegativity depend on the atomic radius and effective nuclear charge acting on valence electrons.

The correct answer is Fluorine. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Nucleus. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Greater. Periodic trends like ionization energy, electron affinity, and electronegativity depend on the atomic radius and effective nuclear charge acting on valence electrons.

The correct answer is 2. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is KJ mol⁻¹. Periodic trends like ionization energy, electron affinity, and electronegativity depend on the atomic radius and effective nuclear charge acting on valence electrons.

The correct answer is Diameter. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Larger. The modern periodic table, proposed by Moseley, is arranged based on increasing atomic numbers, which fundamentally determines an element's chemical properties.

The correct answer is 10. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Atomic radii. Vertical columns are called groups or families. Down a group, atomic size increases and ionization energy decreases due to the addition of electron shells.

The correct answer is 77. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Decreases. In the periodic table, horizontal rows are called periods. Across a period, atomic size generally decreases while ionization energy and electronegativity increase.

The correct answer is 10⁻¹² m. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is pm. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Electron. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 16. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 2nd. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Basic. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Reactivity increases down the group. Specific groups have distinct family names (e.g., Group 1 = Alkali Metals, Group 17 = Halogens, Group 18 = Noble Gases) reflecting their shared chemical behaviors.

The correct answer is Basic. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Same. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Different. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Oxygen. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Dipositive ions. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Increases. Specific groups have distinct family names (e.g., Group 1 = Alkali Metals, Group 17 = Halogens, Group 18 = Noble Gases) reflecting their shared chemical behaviors.

The correct answer is Halides. Specific groups have distinct family names (e.g., Group 1 = Alkali Metals, Group 17 = Halogens, Group 18 = Noble Gases) reflecting their shared chemical behaviors.

The correct answer is Na. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 17. Vertical columns are called groups or families. Down a group, atomic size increases and ionization energy decreases due to the addition of electron shells.

The correct answer is Noble gases. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 32. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Alkali metals. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 2. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Bromine. Specific groups have distinct family names (e.g., Group 1 = Alkali Metals, Group 17 = Halogens, Group 18 = Noble Gases) reflecting their shared chemical behaviors.

The correct answer is HF > HCl > HBr > HI. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Fluorine. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is p. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Increase. The modern periodic table, proposed by Moseley, is arranged based on increasing atomic numbers, which fundamentally determines an element's chemical properties.

The correct answer is 8. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Periods. In the periodic table, horizontal rows are called periods. Across a period, atomic size generally decreases while ionization energy and electronegativity increase.

The correct answer is d block. Specific groups have distinct family names (e.g., Group 1 = Alkali Metals, Group 17 = Halogens, Group 18 = Noble Gases) reflecting their shared chemical behaviors.

The correct answer is Transition elements. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 7. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Halogens. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 1. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Alkali metals. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is All of these. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 7th. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Number of electronic shells. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Number of valence electrons. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Actinium. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 57. The modern periodic table, proposed by Moseley, is arranged based on increasing atomic numbers, which fundamentally determines an element's chemical properties.

The correct answer is 7th. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Actinides. The modern periodic table, proposed by Moseley, is arranged based on increasing atomic numbers, which fundamentally determines an element's chemical properties.

The correct answer is 6th. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Lanthanides. The modern periodic table, proposed by Moseley, is arranged based on increasing atomic numbers, which fundamentally determines an element's chemical properties.

The correct answer is All of these. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Normal periods. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Both a and b. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is p. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is s. Elements are classified into s, p, d, and f blocks based on the subshell their valence electrons occupy, dictating their group properties.

The correct answer is Sub-shell. Elements are classified into s, p, d, and f blocks based on the subshell their valence electrons occupy, dictating their group properties.

The correct answer is 4. Elements are classified into s, p, d, and f blocks based on the subshell their valence electrons occupy, dictating their group properties.

The correct answer is 32. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 32. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 18. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 8. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 2. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 7. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 18. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Elements. The modern periodic table, proposed by Moseley, is arranged based on increasing atomic numbers, which fundamentally determines an element's chemical properties.

The correct answer is Periods. In the periodic table, horizontal rows are called periods. Across a period, atomic size generally decreases while ionization energy and electronegativity increase.

The correct answer is Group. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Decreases. In the periodic table, horizontal rows are called periods. Across a period, atomic size generally decreases while ionization energy and electronegativity increase.

The correct answer is Period. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Atomic number. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Third period and 14th group. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Na. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is nd¹ns². Elements are classified into s, p, d, and f blocks based on the subshell their valence electrons occupy, dictating their group properties.

The correct answer is Sulphur. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Group 1. Periodic trends like ionization energy, electron affinity, and electronegativity depend on the atomic radius and effective nuclear charge acting on valence electrons.

The correct answer is Fluorine. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 3. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Actinides. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 7. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Normal. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 18. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Family. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is ns²np¹. Elements are classified into s, p, d, and f blocks based on the subshell their valence electrons occupy, dictating their group properties.

The correct answer is p-block elements. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Atomic mass. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Moseley. The modern periodic table, proposed by Moseley, is arranged based on increasing atomic numbers, which fundamentally determines an element's chemical properties.

The correct answer is 700. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 7. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is IIA. Specific groups have distinct family names (e.g., Group 1 = Alkali Metals, Group 17 = Halogens, Group 18 = Noble Gases) reflecting their shared chemical behaviors.

The correct answer is Xe. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is 8. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is High ionization energies. Specific groups have distinct family names (e.g., Group 1 = Alkali Metals, Group 17 = Halogens, Group 18 = Noble Gases) reflecting their shared chemical behaviors.

The correct answer is Increase from top to bottom in a group. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is Long periods. This reflects the systematic organization of the periodic table, where element properties show predictable periodic trends based on electronic configuration.

The correct answer is All metals. Specific groups have distinct family names (e.g., Group 1 = Alkali Metals, Group 17 = Halogens, Group 18 = Noble Gases) reflecting their shared chemical behaviors.