Question

3
select the correct answer
which of these elements is an alkaline earth metal?
a. potassium (k)
b. calcium (ca)
c. chromium (cr)
d. gallium (ga)

Explanation:

Alkaline earth metals are the elements in Group 2 of the periodic table. Potassium (K) is in Group 1 (alkali metal), calcium (Ca) is in Group 2, chromium (Cr) is a transition metal, and gallium (Ga) is a post-transition metal.

Answer:

B. calcium (Ca)