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### homework problem 4.17

Posted: **Sat Jun 02, 2018 7:02 pm**

by **Rosamari Orduna 1D**

So #4.17 asks: Predict the bond angles at the central atom of the following molecules and ions: (a) ozone, O3; (b) azide ion, N3-; (c) cyanate ion, CNO-; (d) hydronium ion, H3O+.

Can someone please explain why N3- and NCO- can both have bond angles of about 180?

thank yyou

### Re: homework problem 4.17

Posted: **Sat Jun 02, 2018 8:44 pm**

by **Andre-1H**

If you're ever confused about shape I think the best way is to start by drawing the lewis structure. For N3- the lewis structure has only 2 regions of electron density and no lone pairs, so it is linear. (Using this website :

https://chemstuff.co.uk/academic-work/a ... molecules/ ) The bond angle for all linear shapes is 180 degrees. The same concepts can be applied for NCO-. let me know if i wasn't clear

### Re: homework problem 4.17

Posted: **Sun Jun 03, 2018 5:08 pm**

by **Maria Roman 1A**

This may help visualize the molecules' 180 angles

### Re: homework problem 4.17 [ENDORSED]

Posted: **Sun Jun 03, 2018 5:12 pm**

by **Vivian Gonzalez 1A**

Based on the lewis structure there are 2 regions of electron density, therefore, the molecule has a linear shape with 180 degree angles.

### Re: homework problem 4.17

Posted: **Sun Jun 03, 2018 11:09 pm**

by **CarinaVargas1J**

Well since both shapes are linear, they have bond angles of 180 degrees.