Answered

Which quantity identifies an element?
(1) atomic number
(2) mass number
(3) total number of neutrons in an atom of the
element
(4) total number of valence electrons in an atom of
the element



Answer :

polwade
The correct answer is (1) I think.
Explanation: The atomic number of an element is the number of protons in the nucleus of each atom of that element. This means that the number of protons is the characteristic which makes each element unique compared to all other elements.
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