![]() ![]() Mass number = number of protons + number of neutrons Number of neutrons = mass number - atomic number In other words, the number of neutrons in any atom is its mass number minus its atomic number. The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. Mass Number Equals Protons plus NeutronsĮach atom also has a mass number, denoted by the symbol A. The relationship between atomic number and the number of protons or electrons can be stated as follows:ī. Uranium has the atomic number 92 its atoms contain 92 protons and 92 electrons. Oxygen has the atomic number 8 its atoms contain 8 protons and 8 electrons. The atomic number has the symbol Z.ĭifferent elements have different atomic numbers therefore, atoms of different elements contain different numbers of protons (and electrons). It therefore also equals the number of protons in the nucleus and also equals numerically the number of electrons in the neutral atom. The atomic number equals the charge on the nucleus. The atomic numbers are listed along with the names and symbols of the elements on the inside cover of the text. Atomic Number Equals Electrons or Protons ![]()
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