a
has three pro tons and two neutrons
b
has two protons and one neutron
c
has two protons and three neutrons
d
has one proton and two neutrons
e
cannot exist because it has the same mass number as tritium
Explanation
Correct Option
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EmmanuelOlaposi061
2 years ago
@myschool d answer is B cos even Wikipedia says that it is a stable isotope
