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If Argon has a mass number of 40 and an atomic number of 18, how many electrons does a neutral atom contain? A.40 B.20 C.22 D.18
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If Argon has a mass number of 40 and an atomic number of 18, how many electrons does a

neutral atom contain?

A.40
B.20
C.22
D.18

User Mbonnin
by
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1 Answer

4 votes
C) 22 because the mass of a neutron is 1 amu and a proton is also 1 amu, so 40-18=22
User Jawap
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