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Sapling HW Bond Length

Posted: Thu Nov 12, 2020 7:46 am
by KMcFarland_2L
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?

Re: Sapling HW Bond Length

Posted: Thu Nov 12, 2020 8:07 am
by Navdha Sharma 3J
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.

Re: Sapling HW Bond Length

Posted: Thu Nov 12, 2020 5:37 pm
by Michael Sun Dis 3G
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.

Re: Sapling HW Bond Length

Posted: Thu Nov 12, 2020 7:45 pm
by Nathan Lao 2I
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.

Re: Sapling HW Bond Length

Posted: Thu Nov 12, 2020 8:27 pm
by Shruti Kulkarni 2I
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.

Re: Sapling HW Bond Length

Posted: Sat Nov 14, 2020 8:07 pm
by Joel Meza 3I
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.

Re: Sapling HW Bond Length

Posted: Sat Nov 14, 2020 8:32 pm
by Jason_John_2F
s is below o on the periodic table meaning that the atomic radius is larger and therefore the bond length is larger

Re: Sapling HW Bond Length

Posted: Sat Nov 14, 2020 9:07 pm
by Jonathan3B
Larger atomic radius=longer bond length