Question

How many nucleons are present in 2 atoms of an element which has atomic mass 2u.

Answer 1

element with 2u atomic mass is deuterium ²₁D

deuterium has 1 neutron, 1 electron and 1 neutron

total nucleons = 1 proton + 1 neutron = 2 nucleons

2 atoms = 2 * 2 = 4 nucleons