How to complete the reactions?

Question

^2₆28₈₈Ra -> __ + ⁰_-1e + v

²³⁰_{868Rn ->} ²¹⁶₈₄Po+___

Ccomplete the following reaction

State what type of nuclear decay it is

Explain why is it that type of reaction

Answer 1

²²⁸₈₈Ra -> __ + ⁰_-1e + v

The daughter nucleus should be Ac(m 228, Z 89) so that mass and charges are made conserved. It has to be a beta emission since in this radiation a beta particle (aka a high energy electron) is emitted.

I also wonder the last symbol is a Gamma Ray since this emission Gamma rays were emitted by the Ra isotope.

For the second equation in which there has to be a typo as Rn mass at 220

Balance mass and balance charge, therefore this is an alpha emission in which a helium nucleus (m 4, Z 2) is emitted.