Question

1. choose the best answer.

what element in group 17 has the highest electronegativity?
cl
f
br
i

1. choose the best answer.

which of these four elements would have an electron affinity higher than that of oxygen?
f
be
li
ca

Explanation:

• For question 3:
• Electronegativity is a measure of an atom's ability to attract electrons in a chemical bond.
• In group 17 (halogens), as we move up the group, the atomic radius decreases. A smaller atomic radius means the nucleus is closer to the valence electrons, and it can attract electrons more strongly.
• Fluorine (\(F\)) is at the top of group 17. Chlorine (\(Cl\)), bromine (\(Br\)), and iodine (\(I\)) are below it in the group. So, \(F\) has the highest electronegativity among them.
• For question 4:
• Electron affinity is the energy change when an electron is added to a neutral atom to form a negative ion.
• Fluorine (\(F\)) has a higher electron affinity than oxygen. Beryllium (\(Be\)) is a metal in group 2 with a relatively low electron affinity as it tends to lose electrons. Lithium (\(Li\)) is in group 1 and also has a lower electron affinity compared to \(F\). Calcium (\(Ca\)) is in group 2 and has a much lower electron affinity as it is a larger atom and less likely to gain an electron compared to \(F\).

Answer:

1. B. \(F\)
2. A. \(F\)