What does a calcium atom contain?

What does a calcium atom contain?

If we take calcium-40 as an example, then it contains 20 neutrons, 20 protons and 20 electrons, but depending on the calcium isotope, the number of neutrons may vary, but the number of protons or electrons is always the same, only if calcium is not ionized. 20 electrons and 20 protons if the calcium atom is at rest.

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