An element has 18 protons and 20 neutrons. What is it's symbol, including the mass number?

1 Answer
anor277
Dec 13, 2017

Surely you must have a Periodic Table beside you....?

Explanation:

You gots #Z=18#, the atomic number, where #Z# is the number of nuclear protons. The number of protons defines the element....and thus we got calcium....

....and with 20 neutrons we got the #""^38Ca# isotope....the which is rather short-lived....

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