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Bond strength is determined by a number of factors. Bonds are weakened if the atoms involved are large or if there are lone pairs on nearby atoms. Bond strength is also affected by the electronegativities of the atoms involved and their bond lengths (or resonance). Bond multiplicity or order (how many bonds there are) is also very influential. The more bonds there are, the shorter, and therefore stronger, the bonds are.
Bond strength is dependent on a variety of factors. The greater the bond the number, the stronger the bond, meaning that a triple bond is stronger than a single bond. Resonance also stabilizes a chemical structure, and increases the strength of the bonds in the molecule. Lone pairs on the atoms repel each other, weakening the bonds. Atomic radius also affects bond strength, because if a nucleus cannot get close enough to the electrons, a weaker bond results.
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