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These are the equations I'm given.

i) [tex]^{28}_{14}Si \ + \ ^1_0n \ \rightarrow \ ^{25}_{12}Mg \ + \ X[/tex] (neutron bombardment?)

ii) [tex]^{186}_{75}Re \ + \ ^1_1p \ \rightarrow \ X \ + \ ^0_{-1}e[/tex] (proton bombardment?)

iii) [tex]^{208}_{83}Bi \ + \ ^0_{-1}e \ \rightarrow \ ^{207}_{81}Tl \ + \ X[/tex] (electron bombardment?)

iv) [tex]^{14}_6C \ \rightarrow \ ^{13}_6C \ + \ X[/tex] (decay?)

As far as i can figure, these are the answers. If someone could please point out if and where i might be going wrong I would appreciate it.

i) [tex]X \ = \ ^4_2He[/tex]

ii) [tex]X \ = \ ^{187}_{75}Re[/tex]

iii) [tex]X \ = \ ^1_1p[/tex]

iv) [tex]X \ = \ ^0_1n[/tex]

I'm sure these seem pretty simple(not to me), but if you could verify my answers, it would really help me with some conceptual understanding.

Thanks very very much in advance.