14 C →
Lie- +
14N
6
A) Two protons are lost and the mass number changes by minus four
B) One proton is lost and there is no change in the mass number
C) Two protons are gained and the mass number changes by a gain of four
D) One proton is gained and there is no change in the mass number

Which statements best describe the work of marie and pierre curie? check all that apply. they discovered radioactivity. they came up with the term “radioactivity.” they conducted experiments with uranium-containing minerals and pure uranium. they conducted experiments with uranium-containing minerals and photographic plates. they discovered two new radioactive elements.