1. I. Nuclear Equations
Mass numbers and atomic numbers are conserved in nuclear equations

2. J. Nuclear Reactions – Alpha Decay
Alpha particles He 2+ charge
Mass number: 238 =
Atomic number: 92 =

3. 90 230 Th  88 226 Ra + ___ 2 4 He Balancing Nuclear Equations
Mass number: 230 = x
x = = 4
Atomic number: 90 = 88 + y
y = = 2
2 4 He

4. 88 228 Ra  89 228 Ac + ___ J. Nuclear Reactions - Beta Decay
Beta (ß) particles −1 0 e charge
Mass number: 228=
Atomic number: 88 = 89 + (-1)
Ra  Ac + ___

5. 93 239 Np  94 239 Pu + ___ −1 0 e Balancing Nuclear Equations
Mass number: 239 = x
x = = 0
Atomic number: 93 = 94 + y
y = = -1
−1 0 e

6. Gamma ray 0 0  zero charge Mass number: 230 = 226 + 4
J. Nuclear Reactions - Gamma Radiation
Gamma ray  zero charge
Mass number: 230 =
Atomic number: 90 =

7. 0 0  56 137 Ba  56 137 Ba + ___ Balancing Nuclear Equations
Mass number: 137 = x
x = = 0
Atomic number: 56 = 56 + y
y = = 0
0 0 