The use of renewable energy helps protect the global environment.

I ionized hydrogen in a chemistry experiment.

I learned about the process of ionization in chemistry class.

I lost my wallet.

Each element of this set has a unique characteristic.

The minimum effort is required to solve this problem.

Your cooperation is needed for this project.

I need you.

An electron is a part of an atom.

Understanding the structure of atoms is a fundamental part of physics.