A) 3
B) 5
C) 7
D) 9
Correct Answer: B
Solution :
We know that Atomic number = number of protons = number of electrons Mass number = number of proton\[+\]number of neutrons \[\therefore \]number of neutrons = mass number\[-\]atomic number \[=9-4=5\]You need to login to perform this action.
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