Question

Helium has an atomic mass of u and two protons in two nucleus how many neutrons does it have

Answer 1

heyaaa.....

proton + neutron = atomic mass
2 + x =u
x=u-2

hope this helps

Answer 2

the value of u is 4 as helium has atomic mass 4u (not mentioned in the question)

then helium atomic mass :- 4u
number of protons :- 2
FORMULAE:- number of neutrons = mass number - number of protons
therefore. 4-2=2

thus number of neutrons= 2

hope it helps! not copied from net mark as brainliest if you are satisfied