Question

selected properties of antimony (sb) and iodine (i) are listed in the table below.

element	atomic radius (pm)	first ionization energy (kj/mol)	electron affinity (kj/mol)	electronegativity
i	140	1008	-295	?

which predictions can most likely be made?
o sb has a lower ionization energy but a higher electronegativity than i.
o sb has a higher ionization energy but a lower electronegativity than i.
o sb has a lower ionization energy and a lower electronegativity than i.
o sb has a higher ionization energy and a higher electronegativity than i.

Explanation:

Step1: Recall periodic - trend of ionization energy

Ionization energy increases across a period. Sb and I are in the same period, and I is to the right of Sb. So Sb has a lower first - ionization energy than I.

Step2: Recall periodic - trend of electronegativity

Electronegativity increases across a period. Since I is to the right of Sb in the same period, I has a higher electronegativity than Sb.

Answer:

Sb has a lower ionization energy and a lower electronegativity than I.