Question

which of the following is an alkali metal? a. krypton (kr) b. lithium (li) c. calcium (ca) d. boron (b)

Explanation:

Alkali metals are in Group 1 of the periodic table. Lithium is in Group 1. Krypton is a noble - gas in Group 18, calcium is an alkaline - earth metal in Group 2, and boron is a metalloid in Group 13.

Answer:

B. Lithium (Li)