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nikklg [1K]
3 years ago
5

What is the mass number of an atom with 5 protons and 7 neutrons?

Physics
2 answers:
sergij07 [2.7K]3 years ago
8 0
Boron I think look at the periodic table
Alchen [17]3 years ago
3 0
Pretty close to 12 .
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