chlorine (Cl) helium (He) magnesium (Mg) silver (Ag)
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The Periodic Table of the Elements is arranged so that elements with similar characteristics are in the same column. Which element is a highly reactive metal?
Possibilities:
- chlorine (Cl)
- helium (He)
- magnesium (Mg)
- silver (Ag)

magnesium (Mg)