Question

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choose the element with the higher ionization energy from each of the following pairs.

part a
al or in
al
in
the element cannot be determined based on periodic properties alone.
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part b
cl or sb
cl
sb
the element cannot be determined based on periodic properties alone

Explanation:

• Part A: Ionization energy decreases down a group. Al (aluminum) is above In (indium) in Group 13. So, Al has higher ionization energy.
• Part B: Ionization energy generally increases across a period and decreases down a group. Cl (chlorine) is in Period 3, Group 17 and Sb (antimony) is in Period 5, Group 15. Cl is more to the right and higher up in the periodic table. Cl has higher ionization energy.

Answer:

• Part A: Al
• Part B: Cl