(a)The element is Chlorine (Cl) and the atomic number of chlorine is 17.
(b) The atom with the electronic configuration of 2, 8, 7 which is the chlorine is chemically identical to Fluorine (F) which has an atomic number of 9.
(a)The element is Chlorine (Cl) and the atomic number of chlorine is 17.
(b) The atom with the electronic configuration of 2, 8, 7 which is the chlorine is chemically identical to Fluorine (F) which has an atomic number of 9.