Question

Draw a diagrammatic representation of electronic configuration of
potassium and state its valency. (At. No. 19, no. of neutrons = 20)

Answer 1

valency = +1

At.no = 19

formula : z(at.no) = p(proton) = e(electron)

therefore p and e = 19

n = mass.no -p(proton)

= 39 - 19 = 20n

to find mass . no =

p(proton) + n(neutron)

so , 19 + 20 = 39 mass.no