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What is the difference between the number of electrons in an atom of calcium and the number of electrons in an atom of oxygen? ​
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What is the difference between the number of electrons in an atom of calcium and the number of electrons in an atom of oxygen?

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User JoxieMedina
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In order to write the Calcium electron configuration we first need to know the number of electrons for the Ca atom (there are 20 electrons), but , Oxygen is group 8 element, so, the atom of oxygen has 8 protons and 8 electrons
User LostAstronaut
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