'The atomic number of Cl is 17. On the basis of this information, answer the questions that follow :
(a) Write the electronic configuration of Cl.
(b) Find its valency.
(c) To which group does it belong ?
(d) Identify the type of ion it will form.
(e) Write down the formula of the compound it forms with other elements.

Explanation

(a) Electronic configuration of Cl (Z = 17) = 2, 8, 7. (b) Valency of Cl = 8 - 7 = 1
(c) Group to which Cl belongs= 17 (d) Type of ion formed by Cl = Anion `(Cl^(-))`.
(e) Formula of compound with other elements (M) `= MCl_(x).`
Here x is the valency of the element.