Question

Rank the following elements by electron affinity, from most positive to most negative EA value. Rank from most positive to most negative. To rank items as equivalent, overlap them. View Available Hint(s)

Krypton, Bromine, Bismuth, Selenium, Rubidium

Answer 1

Br>Se>Bi>Rb>Kr

Bromine has 7 e, to complete octet it requires one electron, which completes its octet hence EA is very high.

Se has 6 e in valance shell, it requires 2 electrons, it can also accept one electron easily.

Bi requires 3 electrons to complete its octet, accepting one electron is possible.

Rb is less likely to accept electrons as it is a alkali metal, it would more likely lose electrons,

Kr on the other hand has a complete octet, is a nobel gas and ha EA value of zero!