Question

Potassium has an atomic number of 19.

Which of a potassium atom's electrons are its valence electrons?
Select one:
a. Those in the third shell from the nucleus.
b. Those in the second shell from the nucleus.
c. Those in the outermost shell.
d. Those in the innermost shell.

Answer 1

The correct response would be C. Those in the outermost shell, and of highest electron energy are the valence electrons for potassium.