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A LITTLE SOMETHING WORTH KNOWING

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Helium · chemical symbol

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Helium was identified in sunlight decades before it was found on Earth, and now fills balloons and airships. Source: Helium ↗

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More from The Elements

A few more worth knowing.

  1. 59Compounds of this highly reactive halogen are used in toothpaste to help prevent decay.RECALL
    Fluorine

    Fluoride compounds help protect teeth; elemental fluorine is highly reactive and toxic.

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  2. 60Fluorine · chemical symbolRECALL
    F

    Fluoride compounds help protect teeth; elemental fluorine is highly reactive and toxic.

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  3. 61This element glows in electrified signage and belongs to the noble gases, a family that rarely reacts with anything.RECALL
    Neon

    Neon glows in electrified signage and belongs to the noble gases, a family that rarely reacts with anything.

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