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OpenStudy (anonymous):

What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons?

OpenStudy (goldphenoix):

To find the mass number of an element, we find the sum of protons and neutrons. 19+20= 39.

OpenStudy (anonymous):

Mass number is the number of nucleons ( neutrons + protons) present in an atomic nucleus. Here the mass no is 19+ 20 = 39.

OpenStudy (anonymous):

I agree with Ritika6 and GoldPhenoix

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