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STatiana [176]
2 years ago
15

A collection of orbitals around the nucleus, each having its own energy level.

Biology
1 answer:
o-na [289]2 years ago
7 0

Answer:

Electron shells

Explanation:

Electron shells surround the nucleus of an atom.  Each shell has its own energy level, meaning it can contain a specific number of electrons at any given time.

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