An element has an atomic number of 18 and an atomic mass of 40. The number of neutrons in the nucleus of an atom of this element
is????
1 answer:
Answer: 22 neutrons
Explanation: 40 is the mass number = atomic mass = total number of protons and neutrons in atomic nucleus
18 is the number of protons in the nucleus of this atom
Then 40 - 18 = 22 neutrons
and this is Argon
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