In the nuclear rxn below, what is X?

[Smooth Operater]

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Hello,

X + proton --> 22Mg + neutron

a. 21 Ne
b. 23 Mg
c. 21 Mg
d. 22 Na
e. 23 Na

*note* the numbers are mass numbers


I chose E, but Barron said D. I think I am right on this. Can anyone confirm it? Thanks!

 

[DrBowtie]

Proton and Neutron have roughly equal weights so you know the mass number should be the same on each side.

That eliminates all but D.