![]() ![]() The atomic number is listed above the symbol of the element whereas the mass number is placed below. Both of these numbers can be found on the periodic table. The number of neutrons in an atom can be calculated by subtracting the atomic number from the atomic mass. Moreover, the number of protons never changes for an element. Since oxygen has an atomic number of eight, there must be eight protons total. ![]() The atomic number is located above the element’s symbol. According to the periodic table, oxygen has the atomic number eight. The number of protons in an atom is equal to the atomic number of the element. The easiest way to find the atomic number, is to look on a periodic table, the atomic number is in the upper left corner, or is the largest number on the square. The atomic number of an element is simply the number of protons in its nucleus.
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