Question

Examine the image of a potassium atom. (Image is below)

Which of the energy levels in the atom is the valence shell?
A
B
C
D

Answer 1

The answer to your question is D.

Step-by-step explanation:

Potassium has 4 energy levels in the first level (A) has only 2 electrons,

in the second energy (B) level has 8 electrons, in the third energy level (C) also has 8 electrons and in the fourth energy level has only one electron.

Valence electrons are located in the outermost shell so Potassium has only one electron located in the shell D.