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8 May, 19:08

An element's atomic mass does not include the mass of its

Electrons

Protons

Neutrons

+3
Answers (1)
  1. 8 May, 19:36
    0
    Mass of electrons are not included when calculating the atomic mass of element. Atomic mass of the element is equal to proton + neurons. Example the the mass number of Nitrogen can be calculated as 7 protons + 7 neutrons to give 14. thus nitrogen has a mass number of 14
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