An atom has electronic configaration of2,8,7 what is the atom number of this element
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The atomic number of an atom is the number of protons present in it. Number in of protons is equal to number of electrons .So atomic number can also be said as the number of electrons present in an atom. So the atomic number of atom given atom is sum of all electrons i.e.2+8+7
= 17. The atom is the atom of chlorine.
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