Question

Which element from this portion of the table chemically reacts in a way similar to the way the element chlorine (Cl) reacts? (1) Si (3) Xe (2) O (4) I ?

Answer 1

D. I or Iodine

This is because they are both in the same periodic family (the halogens) and thus the number of valence electrons are the same

Answer 2

Answer: (4) I (iodine)

Explanation:

Reactivity of elements follow a trend in such a manner that elements in the same group have similar chemical properties since they react in similar ways during chemical reaction. This similarity is as a result of the same number of valence electrons they have in their respective outer shell. This particular similarity is what classifies them into groups.

In this question, Chlorine is in the same group with Iodine and they're referred to as "halogens" and all halogen have similar chemical reactions. Example, they seek one valence electron to be stable. Easy formation of salts with metals etc