Question

For potassium the total number of principal quantum numbers are

Answer 1

Two eight eight oneoneo

Answer 2

eight

Potassium has one valence electron. This means that there is one electron in its outermost shell (4th shell). Potassium ion, on the other hand, loses an electron and has a complete octet (has eight valence electrons) in its 3rd shell. Recall that the principal quantum number signifies the shell.