Rubidium (Z = 37) and potassium (Z = 19) are similar to sodium in that they have ____ electron(s) in the outermost shell.
A) five p
B) three p
C) two s
D) one d
E) one s

Question

Quizplus · Accepted Answer

Rubidium, potassium, and sodium are all in the same group in the periodic table (alkali metals), which means they each have one electron in their outermost s orbital, making option E correct.

Rubidium (Z = 37) and Potassium (Z = 19) Are