Question

Fluorine (F), chlorine (Cl), and bromine (Br) can all react easily to form compounds with sodium (Na). Which other element could most likely react to form a compound with sodium?
A.
gold (Au)
B.
iodine (I)
C.
magnesium (Mg)
D.
potassium (K)

Answer 1

Answer: It would be iodine because first of all, all of the elements listed are in the halogens column and iodine is too.

Secondly, halogens have one electron to fill and alkaline metals( the column that sodium is in) have one electron to give, so they work well together to have a full valence shell.