The atomic number of an element `X` is `19`.
(a) Write its electronic configuration.
(b) To which group Modern Periodic Table does it belong and what is its valency ?
(c) If 'X' burns in oxygen to form its oxide, what will be its nature-acidic, basic or neutral ?
(d) Write balanced chemical equation for the reaction when this oxide is dissolved in water.

Explanation

(a) Electronic configuration `(Z = 19)` `2, 8, 8, 1`.
(b) The element belongs to group `1`, Valency `= 1`.
(c) The oxide of the element `(X)` is of basic nature.
(d) `underset("Basic oxide")underset()(X_(2)O+H_(2))Orarrunderset("Hydroxide")underset()(2XOH)" [X is potassium (K)]"`