Calcium has an atomic mass of 40 and an atomic number of 20, so the number of neutrons must be _______________

asked Nov 17, 2018 181k views

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7 votes

20 is the right answer for apex

Pezy answered Nov 18, 2018

by Pezy

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The atom would have 20 neutrons.

Mass number = neutrons + protons

40 = neutrons + 20

neutrons = 40 – 20 = 20

Bjarte answered Nov 22, 2018

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