Question

what is the identity (symbol and mass) of a beta particle? what is the identity (symbol and mass) of an alpha particle? what is the identity (symbol and mass) of a gamma ray?

Explanation:

Beta particle is an electron or positron, symbol $_{-1}^0e$ (electron - type) or $_{+1}^0e$ (positron - type), mass is approximately $\frac{1}{1836}$ of a proton mass. Alpha particle is a helium - 4 nucleus, symbol $_2^4He$, mass is about 4 atomic mass units. Gamma ray is a high - energy electromagnetic radiation, symbol $\gamma$, mass is 0.

Answer:

Beta particle: Symbol $_{-1}^0e$ (electron - type) or $_{+1}^0e$ (positron - type), mass $\approx\frac{1}{1836}$ of proton mass.
Alpha particle: Symbol $_2^4He$, mass $\approx$ 4 atomic mass units.
Gamma ray: Symbol $\gamma$, mass = 0.