Question

Two elements a and b have 14 and 9 electrons in m and n shells , respectively . then the ratio of their atomic number is

Answer 1

cromium contain 14e

potassium contain 9e

ratio=24÷19=1.26

Answer 2

A has 2e in K, 8e in L and 14e in N. So total no of e are 24. Since it is a neutral atom hence no of electron=atomic no.

B has 2e in K, 8e in L, 18e in M and 18e in N. So total no of e are 46. Since it is also a neutral atom hence no of electron=atomic no.

So the ratio of atomic no of A:B is 12:23.