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Neon (Ne) has at. wt. of 20.183 and at. no. of 10.

We know that the number of Protons is equal to At. No. and the number of Electrons equals the number of Protons.

The number of Neutrons is the (At. Wt.) - (At. No.)

Thus, we know that Ne has 10 Protons, 10 Electrons and 10 Neutrons.

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Calcium or Ca

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Q: How many neutrons are found in an atom with atomic mass of 20?
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