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Why does carbonate have a valence of two?

Answer 1

Mateo Aguilar

The valency of carbonate is two because it can combine with two hydrogen atoms.

Valency is the number of univalent atoms (e.g., #"H"# or #"Cl"# atoms) that can combine with an atom or an ion.

The structure of carbonate is

Each #"O"# atom has a negative charge, so it can combine with an #"H"^"+"# ion to form carbonic acid.

Since carbonate can combine with two #"H"# atoms, its valency is two.

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Answer 2

Kai Bowman

Carbonate (CO₃²⁻) has a valence of two due to the combination of one carbon atom with three oxygen atoms, forming a stable structure with two shared electrons.

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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.