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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asked Jan 4, 2017 135k views

3 votes

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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high-school

Jason Plank asked

by Jason Plank

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1 Answer

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B. The sum of the protons and neutrons.

DolceVita answered Jan 10, 2017

by DolceVita

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