What isotope has 18 protons and 22 neutrons?

1 Answer
Feb 4, 2016

This a neutral atom of ArgonArgon.

Explanation:

Always remember that the number of protons represent the Atomic no. of that particular element.

In this case the number of protons is 1818,So,the atomic no. is also 1818.

And the element with atomic no. 1818 is ArgonArgon with symbol ArAr

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Now we need to find the mass number of ArgonArgon .
Because MassMass nnumber-AtumberAtomicomic nnumberumber==NNoo ofof nneutronseutrons

Mass number of Argon=4040

No of Neutrons=40-18=22=4018=22

A neutral atom of argon also has 2222 Neutrons.

So,It is clear that this is not an isotope but a neutral atom of ArgonArgon