Answer :
mass number = protons + neutrons
mass number = 5 + 7
mass number = 12
mass number = 5 + 7
mass number = 12
Mass number = No. of protons + No. of neutrons
= 5 + 7
= 12 u.
Thus, the answer is 12 u.
= 5 + 7
= 12 u.
Thus, the answer is 12 u.
