2E.19 C and D

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ayushibanerjee06
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2E.19 C and D

Postby ayushibanerjee06 » Fri Nov 15, 2019 5:17 pm

Predict the shapes and estimate the bond angles of (a) the thiosulfate ion, S2O3-2; (b) (CH3)2Be; (c) BH2- ; (d) SnCl2.

Why are c and d less than 120? I thought they were less than 109.5

Ryan Chang 1C
Posts: 105
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Re: 2E.19 C and D

Postby Ryan Chang 1C » Fri Nov 15, 2019 5:24 pm

The molecules in both c and d both have a bent shape because the central atom formula is AX2E, or in other words the central atom is connected to two bonds and has one lone pair. When this bent shape occurs, the bond angles are slightly less than 120 degrees because there are 3 concentrations of electrons surrounding the central atom (360 degrees divided by 3 is 120 degrees) in this particular planar shape. The bond angles are slightly less because the lone pairs repel the bonds a little further away than normal.


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