which of the following is the composition of an isotope of calcium

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22 protons 20 neutrons 19 electrons

21 protons 20 neutrons 20 electrons

20 electrons 25 neutrons 20 electrons

Sep 26th, 2015

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20 protons 25 neutrons 20 electrons

calcium has 20  protons and therefore 20 electrons 

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Sep 26th, 2015

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