Atom Structure: Electron Shells

Learn why electron shells are responsible for the properties of elements, and whether they are stable or have violent reactions.

Chemistry - Atoms And Bonding - Learning Points.

An element's reactivity is determined by the number of electrons in the outer shell of its atom.

To be perfectly stable, an atom requires a full outer shell of electrons.

The inner shell of every atom can hold only two electrons - as the shells move further away from the nucleus, they can accommodate more electrons.

Potassium, with a single outer shell electron, will react with other elements to leave it with a full outer shell.
A Twig Curriculum Film.
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