Gamma Decay in Nuclear Chemistry?

Question

Okay so I'm a little confused. The paper says that It accompanies other radiation such as alpha or beta decay but does not change the atomic number or the mass number of the nucleus since gamma radiation does not contain any protons or neutrons ([sup]0 [sub]0 γ).

So for these equations, how would I complete this?

[sup]212 [sub]84 Po ---> ___ + [sup]4 [sub]2 He
[sup]81 [sub]34 Se ---> ___ + [sup]0 [sub]-1 e


FYI: [sup] = superscript. the number is supposed to be smaller and higher up.

[sub]= subscript. the number is supposed to be smaller and lower down.

like in a chemical equation =]

Answer 1

212/84 Po -> 208/82 Pb + 4/2 He

81/34 Se -> 81/35 Br + 0/-1 e

Answer 2

212^Po 84--->4^He 2 + 208^Pb 82
Notice with alpha radiation the atomic number decreases by 2 and the ato ic mass decreases by 4.
81^Se 34--->1e- + 81^Br 35
Notice with beta radiation that the atomic number goes up 1 and the mass stays the same. It is thought that a neutron comes apart into an electron which is shot out and an additional proton.
Gamma radiationis energy rays which are sent out also.

Answer 3

polonium-212 ==> alpha particle + lead-208

selenium-81 ==> beta particle + bromine-81