The atomic number of helium is 2.

Database transactions need to ensure their atomicity.

We must not forget the horror of the atomic bomb.

He measures time accurately using an atomic clock.

The safety of nuclear reactors is very important.

The atomic weight of helium is 4.

Nuclear fission is a powerful phenomenon that generates energy.

This nuclear reactor is designed to be very safe.

He is always learning new skills to avoid becoming a desk worker.

He is of Han Chinese descent.