Question

The atomic number of an element 'X' is 19.
a) Write its electronic configuration
b) To which period of the 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

Answer 1

Hi,

Element with atomic number 19 is potassium.

a) electronic configuration is 2, 8, 8, 1

b) It belongs to 4^th period and its valency is + 1

c) potassium oxide is basic in nature.

d) Reaction of potassium oxide with water is given below :

K₂O + H₂O -----> KOH + H₂

Regards