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lisabon 2012 [21]
2 years ago
12

The mass number of an atom is the number of

Chemistry
2 answers:
sergeinik [125]2 years ago
6 0

Answer:

protons plus neutrons

Explanation:

jsut the definition

AlexFokin [52]2 years ago
6 0

Answer:

protons

Explanation:

the sum of the numbers of protons and neutrons present in the nucleus of an atom

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