What are periods?
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What are periods?

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    Omotayo O.
    NG
    Omotayo O.

    where is the animation?

    Karen S.
    GD
    Karen S.

    The amount of shells in which the electrons are contained . if the atom has one shell it will be in period 1.

    Sandra T.
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    Sandra T.

    i want to learn this in German, i have set up in german but the course comes in english anyone got any idea

    Derek H.
    US
    Derek H.

    ???

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