Cl is part of the Group VII elements (halogens) which has a valence electron 7 at neutral state
Recall that atoms prefer to have an 8 electrons around it, therefore halogens tend to accept another electron to have a total of 8 around it. This will make Cl- as Cl's monoatomic ion
Atomic number of Cl is 17 which makes its # of proton equal to 17. Recall that atomic no. = # of protons. At neutral state, protons = electrons which makes neutral Cl having 17 electrons
neutral element: atomic number = # of protons = # of electrons
Write the electron configuration for the monatomic ion formed from Cl.
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