Answer: The nucleus
Explanation: The nucleus is the atom's central core and contains more than 99.9 percent of its mass. Surrounding the nucleus is a cloud of electrons, which makes up most of the atom's volume .
Answer:
The nucleus is the atom's central core. while the surrounding the nucleus is a cloud of electrons, which makes up most of the atom's volume.
Step-by-step explanation:
its the center of an atom
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