... particle, (b) 13 particle, (c) 'I ray, (d) X ray. Name the types of radiation known to be emitted by radioactive elements. Compare the properties of the following: ex particles, ... sum to zero in each compound formula. In part (a), for example, Hg~+ + 2Cl-= (2+) + 2(-1) = 0; in part (b), (+2) + (- 2) = 0; and in part (c),2(+1) + (-2) = O. Figure 2.17 ... and gamma (y) rays. Alpha rays are composed of ex particles, which are actually helium nuclei. Beta rays are composed of f3 particles, which are actually electrons. Gamma rays are...