Question

9 which of the following elements is in period 3? a lithium (li) b boron (b) c gallium (ga) d phosphorus (p)

Explanation:

In the periodic table, elements in period 3 include sodium (Na), magnesium (Mg), aluminum (Al), silicon (Si), phosphorus (P), sulfur (S), chlorine (Cl), and argon (Ar). Lithium is in period 2, boron is in period 2, and gallium is in period 4.

Answer:

D. Phosphorus (P)