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2 February, 09:44

If an atom contains 11 protons and 12 neutrons, what is its atomic number?

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  1. 2 February, 09:45
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    Atomic number is Z. Z=number of protons, so Z=11
  2. 2 February, 09:56
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    The sodium has 11 protons and because it is neutral it has 11 electrons.
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