Question

atoms that have the same number of valence electrons in their outer shell
a. are all metallic elements.
b. belong to the same family of elements.
c. must be atoms of the same element.
d. are all non - metallic elements.

Explanation:

Elements in the same group (family) of the periodic table have the same number of valence electrons in their outer - shell. For example, all elements in Group 1 have 1 valence electron. These elements can be metals, non - metals or metalloids and are not necessarily the same element.

Answer:

B. belong to the same family of elements