Question

The atomic mass of an atom do not contain electrons because

Electrons do not exist in all atoms.(a)
Electrons are so small that it does not affect the mass of an atom.(b)
Electrons are do not contain mass.(c)
Electrons are not as important as protons and neutrons.(d)

Answer 1

Electrons are so small that it does not affect the mass of an atom.

Step-by-step explanation:

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Answer 2

Answer:B
Electrons are so small, there weight is negligible