Videos A to Z

• 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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• Atoms: Nucleus of atom

  
  • 3-5
  • 6-8
  • 9-12

  The nucleus is the dense core of an atom. It contains over 99 percent of the mass of an atom, but occupies a miniscule amount of the space.  » more info

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• Atoms: Rutherford's model of atom

  
  • 3-5
  • 6-8
  • 9-12

  In Rutherford's model of an atom, positively charged particles are concentrated in a small, dense center of an atom called the nucleus. Negatively charged electrons are scattered around the nucleus.  » more info

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• Atoms: Size of electron

  
  • 3-5
  • 6-8
  • 9-12

  Electrons are precisely one two-thousandth of the mass of a proton or neutron.  » more info

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• Atoms: Subatomic particles III

  
  • 3-5
  • 6-8
  • 9-12

  The nucleus of an atom contains positively charged protons and neutrally charged neutrons. Negatively charged electrons orbit the nucleus.  » more info

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