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An atom has 5 protons and 7 neutrons. What is its mass number?

Sagot :

iloveonedirection
mass number = protons + neutrons
mass number = 5 + 7
mass number = 12
tadvisohil886
Mass number = No. of protons + No. of neutrons

= 5 + 7

= 12 u.

Thus, the answer is 12 u.
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