Question

Why in any compound name, like potassium oxide, in book sometimes it say romance number in bracket after the potassium, like Potassium(IV) oxide..​

Answer 1

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THIS IS BECAUSE A SINGLE ELEMENT IS SOMETIMES PRESENT IN MANY FORMS=> FOR EXAMPLE IRON.

THERE ARE MANY TYPES OF IRON.

>>>>>IRON(I)

>>>>>IRON(II)

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