The nucleus makes up about what percentage of the mass of an atom?
A) 99.9%
B) 50%
C) 90%
D) 5%

Name: The nucleus makes up about what percentage of the mass of an atom? A) 99.9% B) 50% C) 90% D) 5%
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Quizplus · Accepted Answer

The nucleus, which contains the atom's protons and neutrons, accounts for nearly all of the atom's mass, approximately 99.9%. The electrons, which orbit the nucleus, contribute very little to the atom's overall mass.

The Nucleus Makes Up About What Percentage of the Mass