Which of the following elements has two valence electrons?

a. Sr

b. Na

c. Al

d. B

The element A. Sr, or strontium, has two valence electrons. You can find this information by locating it on the Table of Elements, where it is in Group 2.

The Correct answer is (A) Sr element.

The explanation:

by looking at the periodic table and look at Group 2 which has elements with two valences we can see the Sr element

and its outer shell has 2 valence electrons.

so, Sr is the element that has two valence electrons.