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This question might seem a little general, but how can we know the strength of the OH bond of third period element hydroxides? Does it increase across the period or does it decrease?But more importantly, on what should we rely in order to understand how the strength of the bond changes?

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  • $\begingroup$ Unless there's resonance, there shouldn't be any change in $\ce{O-H}$ bond energy. Perhaps you meant $\ce{M-O}$, which is a different story. $\endgroup$ – Pritt says Reinstate Monica Apr 28 '17 at 15:14
  • $\begingroup$ @PrittBalagopal The question I've seen says about the O-H bond. $\endgroup$ – user40808 Apr 28 '17 at 15:38
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    $\begingroup$ @PrittBalagopal Of course the strength of O-H bond varies, but in much more complicated ways then OP might suspect. I suggest reading a book about coordination chemistry. Fortunately there are only 3 hydroxides in 3rd row. $\endgroup$ – Mithoron Apr 28 '17 at 15:43
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here we are considering that realative to reduced mass there is great change in force constant that is k in hooks equation. k can be measured by bond energy of O-H bond and C-H bond and the bond energy of O-H bond is 467 kj/mol but C-H has bond energy around 413 kj/mol so o-h bond showes higher frequency in IR.

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