How many electrons are in the highest occupied energy level of an element in group 5a

3 electrons

Explanation:

The elements of group 5A of the periodic table are the following:

nitrogen, sodium, arsenic, antimony and bismuth.

To determine the amount of electrons in the last energy level we need to know the electronic configuration of each element.

Electronic configuration

N: [He] 2s2 2p3

P: 1s2 2s2 2p6 3s2 3p3

As: [Ar] 3d10 4s2 4p3

Sb: [Kr] 4d10 5s2 5p3

Bi: [Xe] 4f14 5d10 6s2 6p3

As we can see they all have 3 electrons in their last energy level.