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ScienceOne small ahaElement

This chemical element has atomic number 15.

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Your new ahaPhosphorus

Phosphorus has 15 protons in every atomic nucleus. Changing that number would make a different element. Source: Phosphorus ↗

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  1. 16This chemical element has atomic number 16.RECALL
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    Symbol S

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  2. 17This chemical element has atomic number 17.RECALL
    Chlorine

    Symbol Cl

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  3. 18This chemical element has atomic number 18.RECALL
    Argon

    Symbol Ar

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