What element(s) in period 4 can form a +3 or +6 ion.

The non metals form anions…

Explaination: Generally non-metals have 4 to 7 electrons in their outermost or valence shell.(Exception Carbon, silicon, etc. they have 4 electrons). Hence to achieve their octet (to have 8 electrons in their valence shell) they accept 1,2 or 3 electrons from other elements accordingly, thereby having -1, -2 or -3 charge on them (turning from neutral atoms to charged anions).

Extra info: non metals react with metals by forming anions and form ionic molecule generally but when non metals react with other non metals they form covalent molecule due to ‘sharing’ of electrons.

Hope it helps

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