What determines an atom's reactivity?
A) How many protons the atom contains.
B) How many energy levels the atom contains.
C) Whether the atom is a metal or a nonmetal.
D) How many valence electrons the atom contains.

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Answer:

D) How many valence electrons the atom contains.

This is the only closest one

because the number of electrons in the outermost shell is the correct answer

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Answer:

D) How many valence electrons the atom contains