cupcaakefired345
cupcaakefired345 cupcaakefired345
  • 16-12-2016
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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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delmars
delmars delmars
  • 16-12-2016
B. The sum of the protons and neutrons. 
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