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adelina 88 [10]
3 years ago
7

Why does the atomic mass of an atom not include the electron?

Health
2 answers:
Alex17521 [72]3 years ago
8 0

Answer:

electron mass is so small that it is not counted in an atom's mass.

Explanation:

Electrons are much smaller than protons or neutrons

almond37 [142]3 years ago
4 0

Answer:

Because the mass contributed by electrons is dwarfed by the nuclear contribution.  There exists three orders of magnitude difference. Electronic mass can be ignored to a first approximation.

Explanation:  

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