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14 July, 23:34

Which of the following is the composition of an isotope of calcium (atomic number 20) ?

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Answers (2)
  1. 15 July, 00:02
    0
    20 protons

    20 electrons (as much elctrons as protons because there has to be same positive and negative to have a neutral atom)

    And the number of neutrons depends of the mass number but in that case, I think that it's a Calcium atom (Ca) and so there are 20 netrons.
  2. 15 July, 02:54
    0
    20 protons

    25 neutrons

    20 electrons
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