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23 December, 19:28

An atom of calcium contains 20 protons. How many electrons does it have?

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  1. 23 December, 22:37
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    Answer: 20 electrons

    Explanation: Assuming that the atom is a neutral atom, it would have 20 protons in its nucleus. The atomic number is the number of protons in the nucleus of a certain kind of atom. In addition, it tells you the number of electrons if that atom is neutral so it would have 20 electrons.
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