The number of neutrons equals 197 minus 79, which is 118. In an electrically neutral atom, the number of electrons equals the number of protons, so there are 79 electrons.
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To find the number of neutrons in sodium (Na) and magnesium (Mg), we subtract the atomic number from the atomic mass: Sodium (Na) has an atomic number of 11 and an atomic mass of 23. Neutrons = 23 – 11 ...