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Atom - Wikipedia Though the word atom originally denoted a particle that cannot be cut into smaller particles, in modern scientific usage the atom is composed of various subatomic particles
Atom | Definition, Structure, History, Examples, Diagram . . . Atom, smallest unit into which matter can be divided without the release of electrically charged particles It also is the smallest unit of matter that has the characteristic properties of a chemical element As such, the atom is the basic building block of chemistry
What Is an Atom? Atom Definition - Science Notes and Projects An atom is the basic building block of matter, consisting of protons, neutrons, and electrons An atom is the smallest unit of matter that forms a chemical element and cannot be divided using any chemical means Every solid, liquid, gas, and plasma consists of neutral or ionized atoms
Atom: Definition, Structure Parts with Labeled Diagram The term ‘atom’ was derived from the Greek word ‘atomos’, meaning ‘indivisible’ The ancient Greek and Indian philosophers were the first to think atom as the basic unit of all matter in the universe
What Is An Atom ? | NRC. gov Anything that has a mass—in other words, anything that occupies space—is composed of atoms While its name originally referred to a particle that couldn't be divided any more—the smallest thing possible—we now know that each atom is generally made up of smaller particles