Atoms that have the same number of outer electrons A.
are all metallic elements.
B.
belong to the same family of elements.
C.
are all nonmetallic elements.
D.
must be atoms of the same element.

1. Atoms that have the same number of valence electrons in their outer shell have similar properties and belong to the same family of elements. Valence electrons are the outermost electrons in the atom and are important in determining how the atom chemically reacts with other atoms.

Explanation:

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ill do it for 100, also this isnt 80 its 40

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