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Nonmetal Hydride Acid Strength Trend

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State

Nonmetal hydride acid strength rises left to right across a period and down a group, tracking electronegativity and bond weakness.

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Hydrogen fluoride is weaker than hydrogen chloride, and ammonia is weaker than water.

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Assuming HF is the strongest hydrohalic acid because fluorine is most electronegative mistakes a period trend for the group trend, where weaker bonds make HF the weakest.