Videos A to Z

  • Bonding: Aluminum atom

    • 3-5
    • 6-8
    • 9-12

    Depicts millions of aluminum atoms. An atom is the smallest part of an element that still has all the properties of that element.  » more info

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  • Bonding: Atomic makeup of lead and gold

    • 3-5
    • 6-8
    • 9-12

    Lead and gold atoms differ from one another because they have different numbers of neutrons, protons, and electrons.  » more info

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  • Bonding: Atoms in pencil

    • 3-5
    • 6-8
    • 9-12

    Atoms are the building blocks of matter.  » more info

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  • Bonding: Bonding of hydrogen atoms

    • 3-5
    • 6-8
    • 9-12

    Two hydrogen atoms form a simple covalent bond. Each atom has a single electron. When the atoms bond, they share electrons and fill their outermost energy level.  » more info

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  • Bonding: Carbon atom

    • 3-5
    • 6-8
    • 9-12

    A carbon atom has 6 protons, 6 neutrons, and 6 electrons.  » more info

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  • Bonding: Chemical bonding

    • 3-5
    • 6-8
    • 9-12

    Atoms bond in ways that make their outermost energy levels complete with electrons, which stabilizes atoms.  » more info

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  • Bonding: Chemical compound

    • 3-5
    • 6-8
    • 9-12

    A chemical compound is made up of two or more elements that are chemically combined or bonded. The combining of atoms to form new substances is called chemical bonding.  » more info

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  • Bonding: Covalent bond video clip

    • 3-5
    • 6-8
    • 9-12

    In covalent bonds, electrons are shared between two different atoms. Atoms are held together by the force of attraction between the positively charged nucleus and the shared electrons.  » more info

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  • Bonding: Crystal lattice video clip

    • 3-5
    • 6-8
    • 9-12

    Many ionic compounds form a regular repeating pattern called a crystal lattice. Salt crystals have a crystal lattice that forms a cubic shape.  » more info

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  • Bonding: Energy levels

    • 3-5
    • 6-8
    • 9-12

    Niels Bohr discovered that electrons are arranged in energy levels. Each energy level can hold certain numbers of electrons. The first can hold 2, the second can hold up to 8, and the 3rd can hold up…  » more info

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