a5bboniHrmay a5bboniHrmay

16-11-2016
Chemistry

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The mass number of an element is equal to
a. the total number of electrons.
b. the sum of the protons and neutrons.
c. less than twice the atomic number.
d. a constant number for the lighter elements.

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AhmatFirz AhmatFirz

16-11-2016

It is equals to the sum of protons and neutrons. C

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