Radioactivity worksheet designed for educational purposes, featuring questions on atomic nuclei, types of radioactive emissions, and their characteristics.

1. a. Protons: 1, Neutrons: 1
b. Protons: 6, Neutrons: 6
c. Protons: 26, Neutrons: 30
d. Protons: 79, Neutrons: 118

2. Alpha: Charge +2, Atomic Symbol ⁴₂He, Can Be Stopped By paper or skin
Beta: Charge -1, Atomic Symbol ⁰₋₁e, Can Be Stopped By aluminum foil
Gamma: Charge 0, Atomic Symbol γ, Can Be Stopped By thick lead or concrete

3. a) α, β
b) α
c) α
d) α
e) α
f) β
g) γ

4. a. Alpha radiation results in the greatest change in atomic number because it emits a particle containing 2 protons, decreasing the atomic number by 2.