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Mazyrski [523]
3 years ago
13

If an atom has 34 protons and 40 neutrons, what is its mass number?

Physics
2 answers:
Liula [17]3 years ago
7 0

The answer is 74

The mass equals the number protons and neutrons.

34+40= 74

natta225 [31]3 years ago
5 0
Mass number is the total of neutrons and protons added together therefore it is 34+40 which is 74. This is the mass number for the atom.
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