Answer:
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
.
