Question

All of the elements in a family or group have similar chemical properties. which of the following statements best explains why this is true?

a. the elements in a group have the same number of protons in their nuclei.
b. the elements in a group have similar atomic mass numbers.
c. the elements in a group have the same number of valence electrons.
d. the elements in a group have similar atomic numbers

Answer 1

The answer is C. They must have the same valance electrons.

Answer 2

C) they have same valence electrons