a
neutron
b
helium atom
c
litgium atom
d
deuterium atom
Explanation
Correct Option
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Discussions (6)

ikediferaymond
3 months ago
I think that {He} atom was used to start the fusion reaction with the nitrogen atom creating one oxygen isotope and release a proton. note:mass number and atomic number of helium is 4&2 respectively
for mass area 14+x=18, x=4
for atomic area 7+x=9.x=2

