Question

If an atom of an element B contain equal no.
of protons and neutrons. Its atomic number
(Z) and mass number (A) are related as 2A +
3Z = 140 then the total number of nucleons
present in one atom of element is :
(1) 60
(2) 80
(3) 40
(4) 50​

Answer 1

Answer:

Its atomic number. (Z) and mass number (A) are related as 2A + 3Z = 140 then the total number of nucleons.