the atomic number of an atom 17 and its mass number is 35 find the number of particle present in it also write its electronic configuration and draw bohar model of the atom .
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It contains 17 protons and 17 electrons. Chlorine ion (Cl-) is formed when Cl gains one electron. So, Cl- has 18 electrons and 17 protons. Therefore, the electronic configuration of Cl- = 2, 8, 8.
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