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The greater the electronegativity of A in A-H for binary acids, across a period, the stronger the acid. The stronger the bond between A and H in A-H down a group, the weaker the acid. For oxoacids, the greater the number of oxygen atoms bound to the central atom, the stronger the acid. Oxoacids can readily lose H+ if resulting anion is stabilized by electron withdrawing atoms which delocalize and stabilize the negative charge.
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