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

  2. Atom: Definition, Structure & Parts with Labeled …

    WebFeb 29, 2024 · Learn what an atom is, how it is composed of subatomic particles, and how it forms the basic unit of matter. Explore the history, properties, and types of atoms with diagrams and FAQs.

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

  4. Atomic mass | Definition, Units, & Facts | Britannica

  5. Bohr model | Description, Hydrogen, Development,

    WebMay 2, 2024 · Bohr model, description of the structure of atoms proposed in 1913 by the Danish physicist Niels Bohr. The Bohr model of the atom, a radical departure from earlier, classical descriptions, was the first that …

  6. What is an Atom? - Definition, Structure, History, and …

    WebApr 19, 2024 · Atom Definition. Atoms are defined as the smallest particle that can exist independently in nature and can participate in a chemical reaction. Atoms are the building block of all the matter in the universe. …

  7. atom·ic mass
    noun
    1. the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
    More about atomic mass
  8. Atom | Definition, Composition & Examples - Lesson

    WebNov 21, 2023 · Learn the definition of an atom, what atoms contain, the nucleus in the middle of an atom, what atoms look like, and examples of atoms.

  9. Atom Definition, Structure & Examples - Lesson

    WebNov 21, 2023 · The scientific definition of atom is the smallest unit of matter that can be divided without releasing electrically charged particles. Atoms are the basic building blocks of all matter.

  10. Atom Definition and Examples - Biology Online …

    WebMay 29, 2023 · An atom is defined as the smallest unit of matter indivisible by chemical means. It constitutes the fundamental building block of a chemical element. In other words, an atom can be called the smallest …