The elements lithium, sodium, and potassium
A)have the same mass number.
B)have the same number of neutrons.
C)are isotopes of each other.
D)are in the same group.
E)are in the same period of elements.

Question

Quizplus · Accepted Answer

The elements lithium, sodium, and potassium are in the same group (Group 1 or alkali metals) because they all have one valence electron and similar chemical properties. They do not have the same mass number or number of neutrons, and they are not isotopes of each other. They are not in the same period of elements either.

The Elements Lithium, Sodium, and Potassium