What is the only element that can form both a cation and an anion?

Answer 1

Hydrogen?

You are probably referring to hydrogen, which can form #1^+# and #1^-# ions.

However, there are other elements that can form both cations and anions, such as arsenic, which can form #3^-#, #3^+#, and #5^+# ions; and tellurium, which can form #2^-# and #4^+# ions.

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Answer 2

Kai Bowman

Hydrogen is the only element capable of forming both an anion and a cation.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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