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The atomic mass of an element whose atoms consist of seven protons, eight neutrons, and seven electrons is _____.
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The atomic mass of an element whose atoms consist of seven protons, eight neutrons, and seven electrons is _____.

User IBeMeltin
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Atomic mass is the sum of the protons and neutrons in the nucleus of any one atom. Here it would be 7+8, or 15, with an atomic number of 7. 
User Uaraven
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