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

    Oct 27, 2025 · However, atoms are made up of three types of subatomic particles: the heavy protons and neutrons that make up the nucleus (the central part of the atom), and the much …

  2. Atomic physics | Structure, Particles & Energy | Britannica

    It attempts to describe and account for the properties of molecules and atoms and their constituents— electrons, protons, neutrons, and other more esoteric particles such as quarks …

  3. atom - Kids | Britannica Kids | Homework Help

    The tiny particles called atoms are the basic building blocks of all matter. Atoms can be combined with other atoms to form molecules, but they cannot be divided into smaller parts by ordinary …

  4. Atom - Development, Theory, Structure | Britannica

    Nov 14, 2025 · Dalton had begun his atomic studies by wondering why the different gases in the atmosphere do not separate, with the heaviest on the bottom and the lightest on the top. He …

  5. atom - Students | Britannica Kids | Homework Help

    Atoms are made up of three basic types of particle: protons, neutrons, and electrons. These particles (as well as other particles smaller than atoms) are known as subatomic particles.

  6. Atomic model | Definition, History, Development, Examples,

    Elements are characterized by the mass of their atoms. Dalton stated that all atoms of an element are identical in shape, size, and mass. When atoms are involved in chemical reactions, they …

  7. Atomism | Definition, Philosophy, History, & Facts | Britannica

    Atomism is usually associated with a “ realistic ” and mechanistic view of the world. It is realistic in that atoms are not considered as subjective constructs of the mind employed for the sake of …

  8. Atom - Quantum Mechanics, Subatomic Particles, Electrons

    Oct 27, 2025 · The different energy levels of atoms are identified with the simple vibrational modes of the wave equation. The equation is solved to find these modes, and then the energy …

  9. Atom - Electrons, Nucleus, Bonds | Britannica

    Oct 27, 2025 · Atom - Electrons, Nucleus, Bonds: Once the way atoms are put together is understood, the question of how they interact with each other can be addressed—in particular, …

  10. Bohr model | Description, Hydrogen, Development, & Facts

    Oct 15, 2025 · However, atoms are made up of three types of subatomic particles: the heavy protons and neutrons that make up the nucleus (the central part of the atom), and the much …