The best replacement for polyatomic ions is monatomic ions.

The best alternatives to polyatomic ions are rated as following:
★★★★★  monatomic ions
★★★★★  radicals
★  radical

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Speaking about polyatomic ions, one probably shouldn't forget about metals.

Other search terms related to polyatomic ions and their ratings are:
★★★★★ metals
★★★★★ oxidation numbers
★★★ oxidation number
★★ formulas
★ transition metals
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polyatomic ions
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