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B. What mass do electrons contribute to the atom?
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B. What mass do electrons contribute to the atom?

User AmarVashishth
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Answer:

Electrons are much smaller in mass than protons, weighing only 9.11 × 10-28 grams, or about 1/1800 of an atomic mass unit. Therefore, they do not contribute much to an element's overall atomic mass.

User Vannen
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