If an atom has 10 as an atomic number and 12 as an atomic mass , how many neutrons does it have

The atom would have two neutrons.

Mass number = neutrons + protons

12 = neutrons + 10

neutrons = 12 – 10 = 2

This would be an atom of neon-12.

No known isotopes of neon have only two neutrons. The neon isotope with the fewest neutrons is neon-16, and it is extremely reactive with a half-life of only 9 × 10⁻²¹ s.

c) always accurate

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the answer is alpha particles hope i you