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All the elements on the Periodic Table differ in their atomic number (the number of protons in the nucleus) for example carbon has 6 protons in its nucleus). Any change in the number of protons and the element is given a different name (7 protons would be nitrogen). As well as protons, there are neutrons in the nucleus. The number of these can change within a single element, for example the most common form of carbon (carbon 12) has 6 neutrons and 6 protons giving it an Atomic Mass of 12, however a less common carbon 13 isotope exists which has 7 neutrons and 6 protons (hence has an atomic mass of 13).

Now with respect tp the electrons, in a neutral element (one with no negative or positive charge) tho number of electrons always equals the number of protons (so carbon will have 6 electrons in both of its isotopes).

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14y ago

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