When a nucleus undergoes beta-minus decay, it changes into
A) another isotope of itself.
B) a higher mass number.
C) a higher atomic number.
D) a higher neutron number.
E) a lower proton number.
Question 2
When an alpha particle is emitted from an unstable nucleus, the atomic number of the nucleus
A) decreases by 2.
B) increases by 4.
C) increases by 2.
D) decreases by 4.
E) increases by 6.