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Jessica Tejero 3L
Posts: 54
Joined: Wed Sep 25, 2019 12:16 am


Postby Jessica Tejero 3L » Sat Dec 07, 2019 7:43 pm

Why is H2O a monodentate when it has 2 pairs of lone electrons?

Alex Tchekanov Dis 2k
Posts: 118
Joined: Sat Aug 24, 2019 12:16 am

Re: H20

Postby Alex Tchekanov Dis 2k » Sat Dec 07, 2019 7:45 pm

Because the oxygen molecule is very small and cannot reach far enough to make bonds. The reason why other molecules are polydentate is because they have long chain structures or are at least more spaced out and can reach closer to make more bonds.

Posts: 100
Joined: Fri Aug 30, 2019 12:16 am

Re: H20

Postby KarineKim2L » Sat Dec 07, 2019 8:20 pm

As Dr. Lavelle mentioned, in order for a molecule to have a stable bidentate, it typically has to have a lone pair then two spacer atoms then a lone pair. H2O does not and therefore it is not large enough to wrap around and bond in two places.

pauline young 1L
Posts: 50
Joined: Thu Jul 11, 2019 12:15 am

Re: H20

Postby pauline young 1L » Sat Dec 07, 2019 8:24 pm

as a general rule, i think if there are more than one lone pairs on the same atom, it would still be considered a monodentate

Brian J Cheng 1I
Posts: 115
Joined: Thu Jul 11, 2019 12:15 am

Re: H20

Postby Brian J Cheng 1I » Sat Dec 07, 2019 8:36 pm

Think of polydentate molecules having two different bonding sites on two different atoms. As mentioned above, "spacer" atoms are need to give the atoms adequate space to bind more than once. The two electron LP's on the oxygen of H2O do not provide enough space to form two bonds to a central atom.

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