An atom with 4 protons, 5 neutrons, and 4 electrons has an atomic mass of _____ amu. (Enter a whole number.)
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It's 9 amu atomic mass = p+nsorry if I'm late hahahhaha and no i didnt take chemistry online but i do other flvs courses hope dis helped peace


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The answer is 9 and the atom is beryllium


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