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18 votes
An atom is mostly made up of... *

Empty space
Heavy electrons crowding the nucleus
A massive nucleus surrounded by clouds of electrons and protons
A massive nucleus consisting of electrons, protons, and neutrons

User XCS
by
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2 Answers

10 votes
D, a massive nucleus consisting of electrons, protons, and neutrons.
User Halfwarp
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8.6k points
3 votes
A massage nucleus consisting of electrons, protons, and neutrons
User Aleks Tkachenko
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8.9k points
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