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  2. What is an atom? 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 smallest unit of matter that has the characteristic properties of a chemical element. Are all atoms the same size?

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

    sciencenotes.org/what-is-an-atom-atom-definition

    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.

  4. Atom - Wikipedia

    en.wikipedia.org/wiki/Atom

    Atoms are the basic particles of the chemical elements. An atom consists of a nucleus of protons and generally neutrons, surrounded by an electromagnetically bound swarm of electrons. The chemical elements are distinguished from each other by the number of protons that are in their atoms.

  5. Atom Definition & Meaning - Merriam-Webster

    www.merriam-webster.com/dictionary/atom

    The meaning of ATOM is the smallest particle of an element that can exist either alone or in combination. How to use atom in a sentence.

  6. What is an atom? Facts about the building blocks of the universe

    www.livescience.com/37206-atom-definition.html

    Atoms are the building blocks of matter and were created after the Big Bang. They are the smallest unit of an element that still retains its properties.

  7. Atoms Definition & Molecule Definition - Atoms are the smallest particle of an element, which may or may not have an independent existence but always take part in a chemical reaction. Molecules always exist independently and retain their physical and chemical properties.

  8. Atoms are tiny particles that form the basic building blocks of all matter in the universe, whether solid, liquid, or gas. All living organisms and nonliving objects found on Earth are made of trillions and trillions of atoms.

  9. What is an atom - NRC

    www.nrc.gov/reading-rm/basic-ref/students/science-101/what-is-an-atom.html

    Anything that has a massin other words, anything that occupies spaceis 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.

  10. A simple introduction to atoms. What are they made from? How do they join together to make molecules?

  11. Atoms and molecules - BBC Bitesize

    www.bbc.co.uk/bitesize/articles/zc86m39

    An atom is the simplest particle of an element. In a particle diagram, atoms are represented by a single coloured circle. When atoms of two or more elements bond together, they make a...