Bohr model of calcium (Ca)

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Bohr model of a calcium atom: a nucleus labeled 20 protons and 20 neutrons, with 2, 8, 8 and 2 electrons on four shells — A Bohr model of a neutral calcium atom, with its nucleus written as text: 20 protons and 20 neutrons. Its 20 electrons fill four shells as 2, 8, 8 and 2. The two electrons on the outer shell are calcium’s valence electrons.

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Answer key

Calcium atom, neutral
Protons: 20 · Neutrons: 20 · Mass number: 40
Electrons: 20 (2, 8, 8, 2 by shell)

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