Biology 1st Edition by Jung Choi, Jean DeSaix, Yael Avissar, Vladimir Jurukovski, Robert Wise,Connie Rye, OpenStax

تمرين 1

Potassium has an atomic number of 19. What is its electron configuration?
A) shells 1 and 2 are full, and shell 3 has nine electrons
B) shells 1, 2 and 3 are full and shell 4 has three electrons
C) shells 1, 2 and 3 are full and shell 4 has one electron
D) shells 1, 2 and 3 are full and no other electrons are present