Atom

/ˈæt.əm/

Meaning & Definition

noun

The smallest unit of a chemical element, consisting of a nucleus surrounded by electrons.

An atom of hydrogen is the simplest and lightest atom.

A minute quantity of a substance; a tiny amount.

Not a single atom of evidence was found to support the claims.

In physics, an atom is described as the basic building block of matter.

All matter is made up of atoms, which combine to form molecules.

From Greek 'atomos' meaning 'indivisible'.

split atom

To make a significant change or innovation.

at the atomic level

Referring to the fundamental structure of matter.

to the last atom

Completely or thoroughly.

molecule

A group of atoms bonded together.

nucleus

The positively charged center of an atom.

electron

A subatomic particle with a negative charge.

A small or insignificant person.

He's just an atom in the big world of finance.

Used to refer to someone very meticulous or detail-oriented.

She’s an atom when it comes to planning events.