Build atoms just as you did before. As you add protons and electrons to the atom, notice that the electrical charge changes. If the atom is charged, it's called an ion. Determine how to make positive and negative ions. Click the plus sign on the Net Charge window. Based on your exploration, which subatomic particle is positive? Which subatomic particle is negative?

To make a positive ion (called cation), add protons or subtract electrons to a neutral atom.

To make a negative ion (called anion), add electrons or subtract protons to a neutral atom.

As you add protons to the atom, its charge becomes more positive, that means, the positive subatomic particle is the proton.

As you add electrons to the atom, its charge becomes more negative, that means, the negative subatomic particle is the electron.

The electron is negative energy

The proton is positive energy

The neutron is neutral energy