If both the first and second shells of an atom are full, what is the total number of electrons present in that atom?

10

Explanation:

the capacity for each shell for the first 20 elements can be given by

2.8.8.2

2 electrons in the first shell

8 in the 2nd and in the 3rd

and 2 in the 4th

so if both the first and 2nd shells are full,

2+8=10 electrons

n has four pairs of electrons in the valence shell, electrons repel one another ,n has 7 protons in its nucleus, and since n has 7 protons, it must fill the second shell, giving it 4 pairs of electrons. the electrons form 3 bonds and 1 lone pair of electrons. each pair of electrons repels the other pairs, so they are equally far apart.

so all of the above

sorry i was late, but i don't know what assignment your talking about, i'm in flvs as well, im in earth space science. but u are behind pace bc every class should be in the 3's or 4'