Question

question 9 of 10
which of the following is an alkali metal?
a. lithium (li)
b. calcium (ca)
c. krypton (kr)
d. boron (b)

Explanation:

Alkali metals are in Group 1 of the periodic table. Lithium (Li) is in Group 1. Calcium (Ca) is in Group 2 (alkaline earth metals). Krypton (Kr) is a noble gas (Group 18). Boron (B) is a metalloid in Group 13.

Answer:

A. Lithium (Li)