1. What changes in the nucleus during alpha decay?

(a) atomic number

(b) mass number

(c) atomic number and mass number

(d) nothing

Mass Number and Atomic Number

Explanation:

Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle and thereby transforms or 'decays' into a different atomic nucleus, with a mass number that is reduced by four and an atomic number that is reduced by two.