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This tag should be applied to questions about the layout, history and interpretation of the periodic table, not to questions relating to specific elements or trends within the table. For these, the tags 'elements' or 'periodic-trends' should be used where appropriate.

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Classification of elements into strictly anions and cations [closed]

I want to know elements of the periodic table which are strictly cations and anions, unlike H, C, Si, Ge, As, Sb, At,etc which can be both (i.e. amphoteric elements). Also, kindly add to this list of …
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