What element has a mass number of 40 and 20 protons?

1 Answer
anor277
Sep 15, 2016

""^40Ca.

Explanation:

If there are 20 protons, then Z=20, and thus the element is calcium. There are a further 20 neutrons in the nucleus, but this just determines the isotope. The ""^40Ca isotope has approx. 97% natural abundance.

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