Videos A to Z

  • Atoms: Atom gaining neutron

    • 3-5
    • 6-8
    • 9-12

    The number of protons of an element is constant, but the number of neutrons can change. Isotopes are atoms of the same element with different numbers of neutrons.  » more info

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  • Atoms: Carbon isotope II

    • 3-5
    • 6-8
    • 9-12

    Carbon can exist as carbon 12 or carbon 14.  » more info

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  • Atoms: Compound

    • 3-5
    • 6-8
    • 9-12

    Compounds are formed by joining atoms of two or more elements. In this animation an ionic bond holds atoms together.  » more info

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  • Atoms: Copper Atom

    • 3-5
    • 6-8
    • 9-12

    Atoms of the same element are exactly alike. This animation depicts a copper atom.  » more info

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  • Atoms: Examples of atoms

    • 3-5
    • 6-8
    • 9-12

    The four atoms depicted here have a different atomic number, which refers to the number of protons in the nucleus. The atomic number of helium is 2, aluminum is 13, hydrogen is 1, and oxygen is 8.  » more info

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  • Atoms: Ice cream atoms

    • 3-5
    • 6-8
    • 9-12

    Matter, such as this ice cream, is made up of many atoms.  » more info

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  • Atoms: Light in tube

    • 3-5
    • 6-8
    • 9-12

    Replicates the experiments J.J. Thomson conducted to develop his model of an atom. Light is produced when an electric current is passed through a tube. When a magnetic charge is introduced, the rays are…  » more info

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  • Atoms: Like charges repel

    • 3-5
    • 6-8
    • 9-12

    Like charges repel one another.  » more info

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  • Atoms: Mass number of sulfur

    • 3-5
    • 6-8
    • 9-12

    The mass number of an atom is the sum of its protons and neutrons. The mass number of sulfur is 32.  » more info

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  • Atoms: Mass number video clip

    • 3-5
    • 6-8
    • 9-12

    The mass number of an atom is the sum of its protons and neutrons.  » more info

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