an element X has atomic number 19 and it's mass number is 39. calculate the number of electrons and neutrons in it.
ATOMIC NO. = NO. OF ELECTRONS = 19
MASS NO. = NO. OF PROTONS + NO. OF NEUTRONS
NO. OF ELECTRONS = NO. OF PROTONS , SO MASS NO., 39 = 19 + NO. OF NEUTRONS
NO. OF NEUTRONS =39 - 19 = 20
THIS ELEMENT IS POTASSIUM
MASS NO. = NO. OF PROTONS + NO. OF NEUTRONS
NO. OF ELECTRONS = NO. OF PROTONS , SO MASS NO., 39 = 19 + NO. OF NEUTRONS
NO. OF NEUTRONS =39 - 19 = 20
THIS ELEMENT IS POTASSIUM