Question

The atomic weight of an element is 39. The number of neutrons in its nucleus is one more than the number of protons. The number of protons, neutrons and electrons respectively in its atom would be ?

Answer 1

Potassium

number of Proton = 6

Number of electron = 6 (no of proton = No of proton)

no of neutrons =6 (atomic mass = no electrons +no of neutrons )

Answer 2

Answer: Let no. of protons be x

no.of neutrons be x+1

Atomic weight = 39

Protons + Neutrons = 39

x+ x+ 1=39

2x=38

x= 19

Here no.of protons = no.of electrons = 19

no of neutrons = 20