Question

what is unique about beta (β) decay compared to alpha emission? *
it always produces gamma radiation
it completely destroys the nucleus
it only occurs in small atoms
it changes the atomic number but not the atomic weight
what is a positron? *
a positive electron (antimatter)
a radioactive particle
a negative electron
a type of neutron

Explanation:

1. In beta - decay, a neutron changes into a proton (or vice - versa), changing the atomic number. Since a neutron's mass is approximately equal to a proton's mass, the atomic weight remains nearly the same. Alpha emission involves the release of a helium nucleus, changing both atomic number and atomic weight.
2. A positron is the antiparticle of an electron, with a positive charge.

Answer:

1. It changes the atomic number but not the atomic weight
2. A positive electron (antimatter)