(i) Which is the element that has an atomic number 17?
(ii) Find the period to which the above element belongs.
(iii) Identify the group to which it belongs.
(iv) Write the electronic configuration of the element.

(i) Chlorine is an element in the periodic table which belongs to the halogen family. Chlorine has an atomic number of 17. The valence shell is M-shell. The number of electrons in its valence shell is 7.
(ii) The element belonging to period 3 and group 17 is Chlorine.
(iii) It belongs to group 17 in the periodic table.
(iv) The electronic configuration of chlorine is$1s^{2}2s^{2}2p^{6}3s^{2}3p^5$.