Linked Questions

-1
votes
1answer
91 views

Is hypervalency a real thing? [duplicate]

I saw a proper debate going on between answers to a question about whether the octet rule could be violated. Some people were pointing to hypervalency in period 3 elements, due to the available d-...
63
votes
1answer
9k views

Why does F replace the axial bond in PCl5?

Why does $\ce{F}$ replace an axial bond in $\ce{PCl5}$? I realize that it would be more stable there than at equatorial bond, but what is the reason of its stability? Similarly in $\ce{AB4}$ type of ...
18
votes
3answers
66k views

What are the correct resonance structures of nitrous oxide?

There was a question in one of my exam papers to draw the resonance structures for $\ce{N2O}$. These are the ones I drew, but they were not awarded marks: The ones in the marking scheme are as ...
21
votes
2answers
6k views

Which relatively simple molecules violate the octet rule?

I'm learning how to draw Lewis diagrams. Everything I've read emphasizes the octet rule. However, to the best of my knowledge, that rule only applies to elements in the first three periods. On our ...
22
votes
2answers
6k views

What is the favoured geometry of chlorine trifluoride?

Why is the first structure on the left more stable than the second one on the right? In the first one the angle between the two pair of nonbonding electrons is about 120° which is a lot less than ...
22
votes
2answers
7k views

PBP vs TBP geometry?

Why are the axial bond lengths greater than those of the equatorial bonds in a trigonal bi-pyramid (TBP) geometry molecule; but the opposite is true for pentagonal bi-pyramid (PBP) geometry molecules? ...
14
votes
3answers
27k views

Why is the bond order in the SO₃ molecule 1.33 and not 2?

$\ce{SO3}$ molecule has three double bonded oxygen to the central sulfur atom. Sulfur has $\ce{sp^2}$ hybridization and it has 6 outer electrons which make the bonds with the oxygen. So shouldn't ...
7
votes
2answers
3k views

How are the hybrid orbitals of sulfur hexafluoride shaped?

On the fluorine end the fluoride atoms are simply completing a $3p$ orbital. On the sulfur end one could posit a hybrid of one $3s$ orbital, two $3p$ orbitals and a three inner $2p$ orbitals. However,...
5
votes
1answer
7k views

How to know if acid is polyprotic?

I know that some acids for sure and for certain are polyprotic. For example sulfuric acid $\ce{H2SO4}$ is diprotic giving you disulfate $\ce{HSO4-}$ and sulfate $\ce{SO4^2-}$ However not all acids ...
-1
votes
1answer
12k views

Why does Sulfur have 12 valence electrons in the Sulfate ion? [duplicate]

So I am completely and utterly confused about why sulfur has $12$ valence electrons. I understand in it's configuration, it has $2$ electrons for the $3\mathrm s$ subshell, and $4$ electrons from its $...
1
vote
1answer
1k views

Why do noble gases like Xe and Kr form compounds, despite offending the octet rule?

According to the octet rule noble gases should not form compounds but xenon and krypton form compounds like $\ce{XeF2}$, $\ce{XeF4}$, $\ce{XeOF2}$ and $\ce{KrF2}$ respectively. Why?
-1
votes
1answer
936 views

Hybridization and excitation of electrons

In case of hybridization of PCl5 why does the electron move to 3d orbital though 4s orbital has a lower energy?
1
vote
0answers
1k views

Why are electron configurations more stable when there are 8 electrons in the outer shell? [duplicate]

In this video on Khan Academy, Sal remarks that 'all atoms envy the noble gases, which are the most stable because they have eight electrons in their outer shell'. I can't think of much of a reason ...
-2
votes
1answer
2k views

Structure of IO2F5(2-) dianion

This question came in my exam to draw the Structure of $\ce{[IO_2F_5]^2-}$ I am confused. Here's what I reasoned: Iodine will have hybridisation $\ce{sp^3d^3}$ so it will be pentagonal bi ...
3
votes
1answer
255 views

Available orbitals for promotion

I am under the impression that elements from the third period onwards can promote electrons into d orbitals to form hybridised orbitals. Why would an element in the third period promote an electron to ...

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