Scientists have unlocked the secret of the atom.
A molecule of water consists of two atoms of hydrogen and one atom of oxygen.
The atom bomb is of catholic concern.
An atom bomb would destroy a city.
The atom bomb is the offspring of the 20th century physics.
Two atoms of hydrogen combine with one atom of oxygen to form a molecule of water.
The tower was blown to atoms by the force of the explosion.
(physics and chemistry) the smallest component of an element having the chemical properties of the element
(nontechnical usage) a tiny piece of anything