Question

atomic weight of an element is 39 the number of neutrons in its nucleus is 1 more than the number of protons the number of protons neutrons and electrons respectively in its atom would be

Answer 1

let no of protons = x
Then no of neutrons =x +1
now x +x+1 =39
As at weight = p+n
So 2x +1 = 39
2x = 38
x = 19
So no of protons =Number of Electrons =19
And Number of Neutrons =19+1=20
The name of the element is Potassium