Chemistry - Lesson on the groups of the periodic table.

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Chemistry - Lesson on valence electrons Learn how to use valence electrons to determine reactivity.

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Chemistry - Lesson on electron configuration. Be sure to follow up with Electron Configurations Part II.

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Chemistry - More on orbitals and electron configuration.

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Chemistry - Lesson on atoms, protons, neutrons and electrons.

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Chemistry - Lesson on elements and atoms.

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Every movement of a hockey puck follows the laws of physics such as, force, impulse, and collision. Video courtesy of NBC Learn - the science of NHL hockey!

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See how much work, energy, and power is involved in hockey’s most famous move, the slap shot. Video courtesy of NBC Learn - the science of NHL hockey!

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