# Question #bc74d

##### 1 Answer

You balance nuclear equations by making the sum of the superscripts and the sum of the subscripts the same on each side of the equation.

#### Explanation:

The symbol for a nucleus is

The number at the upper left is the mass number,

The number at the lower left is the atomic number,

We use special symbols for α and β particles and for protons and neutrons:

In a balanced nuclear equation, the sums of the superscripts and the sums of the subscripts must be equal on each side of the equation.

**EXAMPLE**

Write an equation for the decay of calcium-45 to scandium-45.

**Solution**

Complete the unbalanced equation.

The missing particle must have

The missing particle is

Here's a useful video on balancing nuclear equations.