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aalyn [17]
3 years ago
5

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

Chemistry
2 answers:
VikaD [51]3 years ago
8 0
Mass number = No. of protons + No. of neutrons

= 5 + 7

= 12 u.

Thus, the answer is 12 u.
lisabon 2012 [21]3 years ago
3 0
Mass number = protons + neutrons
mass number = 5 + 7
mass number = 12
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