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Bond angles and lone pairs

Posted: Mon May 28, 2018 5:54 pm
by alexagreco1A
How can we determine whether or not there must be lone pairs from the bond angle?

Re: Bond angles and lone pairs

Posted: Mon May 28, 2018 7:35 pm
by Solene Poulhazan
The less there are of bonding groups, the more lone pairs are present.

Re: Bond angles and lone pairs

Posted: Tue May 29, 2018 4:37 pm
by Hannah Lee 1B
If the bond angle is smaller than usual, then there are more lone pairs. For example, a bent shape with AX2E2 (H2O) has a bond angle of <109.5 while a bent shape with AX2E (O3) has a bond angle of <120.

Re: Bond angles and lone pairs

Posted: Wed May 30, 2018 11:24 am
by Alexandra Wade 1L
Lone pairs repel the bonding angles because the repulsion strength between a lone pair and a bonding pair is greater than two bonding pairs. Therefore with the addition of more lone pairs forces the bonding electrons closer together.

Re: Bond angles and lone pairs

Posted: Wed May 30, 2018 4:02 pm
by Salena Chowdri 1I
if you are given just the bond angle and number of atoms involved, you'll know a lone pair is involved when the bond angle is smaller than usual. this is because lone pairs repel the bonded pairs, causing the angle to be smaller.