An Atom That Contains 20 Protons,21 Neutrons,and 20 Electrons Has

Question

An atom that contains 20 protons,21 neutrons,and 20 electrons has an atomic mass of
A) 20
B) 41
C) 40
D) 61

Accepted Answer

The Answer of An Atom That Contains 20 Protons,21 Neutrons,and 20 Electrons Has