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OpenStudy (anonymous):
What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons?
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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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