13. How many valence electrons does an atom

with 5 electrons, 5 neutrons, and 5 protons

have in its ground state?

A. 5

B.

4.

C.

D.

3

2

The answer to your question is: 3

Explanation:

If an atom has 5 electrons, 5 neutrons and 5 protons, it means that the element is Boron. Boron is situated in the third group A, that means that is has 3 elements in its outermost shell.

Also, if we do the electronic configuration:

1s² 2s²2p¹

If we count the number of electron in the second level of energy, the result will be: 2 in s and 1 in p = 3. Those are the valence electrons.