Enter the number of protons and the number of electrons into the calculator to determine the Atomic Charge.

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## Atomic Charge Formula

The following formula is used to calculate the Atomic Charge.

**AC = P – E**

- Where AC is the Atomic Charge (eV)
- P is the number of protons
- E is the number of electrons

## How to Calculate Atomic Charge?

The following two example problems outline how to calculate the Atomic Charge.

**Example Problem #1:**

- First, determine the number of protons. In this example, the number of protons is given as 50.
- Next, determine the number of electrons. For this problem, the number of electrons is given as 49.
- Finally, calculate the Atomic Charge using the equation above:

AC = P – E

Inserting the values from above and solving the equation:

AC = 50 – 49 = 1 (eV)

**Example Problem #2: **

Using the same process as above, first define the variables required by the formula. In this case, these values are provided as the following:

number of protons = 15

number of electrons = 17

Entering these values gives:

AC = 15 – 17 = -2 (eV)