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Atom

UK //ˈætəm// US //ˈætəm// Pronunciation

Definition

The smallest unit of a chemical element that retains its properties.

Listen to definition

In simple words: The smallest part of a substance.

Examples

• An atom consists of protons, neutrons, and electrons.
• The atom is often referred to as the building block of matter.
• In a molecule, atoms are bonded together.
• Every element on the periodic table is made up of atoms.
• Atoms can combine to form compounds through chemical bonds.

Usage notes

Use 'atom' in scientific contexts. Not common in everyday conversation unless discussing science or chemistry.

Grammar pattern

standalone noun

Memory hint

Sounds like 'add-tom' - imagine adding small pieces together to create something larger.

Collocations

• atomic structure
• atomic theory
• nuclear atom

Synonyms

• particle
• elementary unit
• subatomic particle

Common mistakes

• Confusing atom with molecule - an atom is a single unit, while a molecule is made of two or more atoms.
• Using atom in the figurative sense incorrectly, as it is primarily a scientific term.