All Questions
Tagged with electrons valence-bond-theory
14
questions
-1
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1
answer
162
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Why are different Aluminium valencies observed from NMR and what logic can be used to normalise molar ratios of different valency atoms?
Question 1:
I've observed different chemical shifts in 27Al Nuclear Magnetic Resonance (NMR) spectra of commercial aqueous sodium aluminate, indicating the presence of both trivalent [Al(III)] and ...
- 500
-2
votes
1
answer
76
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Energy Levels in Bohr's Diagram
When drawing the Bohr Diagram of Potassium with 19 electrons, the valence electron goes in the fourth concentric circle, but third energy level can hold up to 18 electrons? Does it mean that ...
- 99
3
votes
0
answers
101
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Why is the bond angle of sulphur difluoride greater than that of hydrogen sulphide?
Why is the bond angle of $\ce{SF_2 (98.05^\circ) > SH_2 (92.11^\circ)}$?
Isn't this contradicting Bent's rule or otherwise electron repulsion rule ? Fluorine is more electronegative and hence it ...
- 1,409
3
votes
1
answer
356
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But what are anti-bonding pi-orbital? In search for an intuitive explanation [closed]
Imagine that you want to explain to an undergraduate why they have to to shade the pi-orbitals in a symmetrical way, i.e. dark on top (+), white on bottom (-) for two neighbouring pi-orbitals because ...
- 918
1
vote
0
answers
34
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Reconciling electron configuration and valence electron distribution over separate energy levels in energy band theory [duplicate]
The electron configuration of a Silicon atom in its ground state is $\ce{1s^2 2s^2 2p^2 3s^2 3p^2}$, or equivalently, $\ce{[Ne] 3s^2 3p^2}$.
When looking at the energy-level scheme of a silicon atom, ...
- 1,083
-1
votes
1
answer
2k
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Why is the oxidation state of Carbon (-4)?
Based on my understanding, atoms try to achieve the electronic configuration of the nearest noble gas, by losing or gaining electrons. For example, Sodium is closest to Neon, so loses an electron so ...
user45201
6
votes
1
answer
2k
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Where do the lone pairs go in the "true" resonance structure?
Consider the "true" resonance structure of $\ce{CO3^2-}$:
The bottom diagram leaves out the 2 lone pairs, so 4 electrons disappeared in the bottom image as compared to the top one. Are these ...
- 166
1
vote
0
answers
140
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How do delocalized π electrons satisfactorily fill π orbitals? [duplicate]
The above example is benzene.
Only six electrons contribute to the 6 π bonds and pπ orbitals. Normally, an orbital requires two electrons to satisfactorily "fill" it. I don't understand how this ...
- 59
-1
votes
1
answer
14k
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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 $...
- 697
2
votes
1
answer
2k
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Delocalised electron in graphite
I have a question regarding the delocalised electron in graphite. There has been conflicting information between books.
Some books said the delocalised electron in graphite exists $\bf{between}$ ...
- 242
8
votes
3
answers
9k
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Does the shared electron in Covalent bonds revolve around nucleus?
We know that electrons are charges that revolve around the nucleus. Then, when in covalent bonds the electron is shared; does the electron obey the rule?
4
votes
2
answers
214
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Why does an element's chemical properties rely only on its valence electrons and not on anything else?
I understand that elements use their valence electrons for their reactions and whatnot, and that the whole idea of the electron-dot structure is all about valence electrons. But why can't the other ...
- 2,247
5
votes
2
answers
8k
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Why do unbonded electrons exist in pairs?
Basically the term which we use to refer them is lone pair. In Lewis structure why we represent those unbonded electron in pairs. Like here (structure of SO2)
Here if we assume both the unbonded ...
- 812
183
votes
8
answers
173k
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Can an atom have more than 8 valence electrons? If not, why is 8 the limit?
According to some chemistry textbooks, the maximum number of valence electrons for an atom is 8, but the reason for this is not explained.
So, can an atom have more than 8 valence electrons?
If ...
- 1,955