Atomic Weight 5
Atomic Weight 5 : Nuclear Energy and Nuclear Disasters. The atomic weight is approximately the sum of the number of protons and neutrons found in the nucleus of an atom. This sum is also called mass number. The atomic weight of oxygen is approximately 16, with most oxygen atoms containing 8 neutrons and 8 protons. Aluminum is 27; it contains 14 neutrons and 13 protons
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