## Sapling HW Bond Length

KMcFarland_2L
Posts: 60
Joined: Wed Sep 30, 2020 9:52 pm

### Sapling HW Bond Length

In the sapling homework, the solution has Si-S having a longer bond length than Si-O. I thought that since O has a larger atomic radius then the Si-O bond length would be longer. Why would Si-S have a longer bond length than Si-O?

Navdha Sharma 3J
Posts: 64
Joined: Wed Sep 30, 2020 9:46 pm

### Re: Sapling HW Bond Length

I think you have interpreted the relationship between the atomic radius of O and S incorrectly. S has a larger atomic radius as atomic radii increases down the group.

Michael Sun Dis 3G
Posts: 50
Joined: Wed Sep 30, 2020 9:37 pm

### Re: Sapling HW Bond Length

S has a larger atomic radius, as it has an extra electron shell. The Si-S bond is longer because of this difference in the atomic radii of S and O.

Nathan Lao 2B
Posts: 59
Joined: Wed Sep 30, 2020 9:40 pm
Been upvoted: 1 time

### Re: Sapling HW Bond Length

The periodic trend for atomic radii is that it increases down a group! Since S is one period below O on the periodic table, it has a larger atomic radius and that's why the bond length would be larger.

Shruti Kulkarni 2I
Posts: 67
Joined: Thu Oct 08, 2020 12:16 am

### Re: Sapling HW Bond Length

Hi! S actually has a larger atomic radius as it has more electrons, which would make the bond length between Si-S longer than that of Si-O. Atomic radii increase down the period! And as S has a larger radius, it will have a longer bond length in comparison to O.

Joel Meza 3I
Posts: 61
Joined: Wed Sep 30, 2020 9:56 pm

### Re: Sapling HW Bond Length

It is actually S that has a larger atomic radius than O. You might have confused the trend for atomic radii on the period table.

Jason_John_2F
Posts: 61
Joined: Wed Sep 30, 2020 9:54 pm

### Re: Sapling HW Bond Length

s is below o on the periodic table meaning that the atomic radius is larger and therefore the bond length is larger

Jonathan3L
Posts: 50
Joined: Wed Sep 30, 2020 9:43 pm