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  1. 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.

  2. Atom | Definition, Structure, History, Examples, Diagram, & Facts ...

    Oct 27, 2025 · An atom is the basic building block of chemistry. It is the smallest unit into which matter can be divided without the release of electrically charged particles. It also is the …

  3. What Is an Atom? Atom Definition - Science Notes and Projects

    Nov 19, 2023 · 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 …

  4. A. What is an Atom? - Linda Hall Library

    3 days ago · An atom is the smallest particle into which an element can be divided without losing its chemical identity. Atoms consist of a heavy central nucleus surrounded by a cloud of …

  5. Where do atoms come from? A physicist explains.

    Jun 23, 2025 · Almost everything on Earth is made up of atoms, but where do these fundamental building blocks come from?

  6. Atoms - What are they? What's inside them? - Explain that Stuff

    Jan 24, 2024 · Most atoms have three different subatomic particles inside them: protons, neutrons, and electrons.

  7. Atom: Definition, Structure, & Parts with Labeled Diagram

    Feb 29, 2024 · What is an atom, who discovered it, & what are they made of? Learn facts, meanings, structure, & parts with examples & pictures or atoms.

  8. What is an atom ? | Nuclear Regulatory Commission - NRC

    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 …

  9. Atom

    Dec 15, 2022 · Atom is a desktop application built with HTML, JavaScript, CSS, and Node.js integration. It runs on Electron, a framework for building cross platform apps using web …

  10. Build an Atom - Atoms | Atomic Structure | Isotope Symbols - PhET ...

    Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Then play a game to test your ideas!