All Questions
49
questions
5
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1
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Why is it that protons and electrons undergo the same amount of deflection in an electric field if they have the same energy?
The question I have is with respect to this diagram. Which depicts a stream of protons and electrons entering a proton field with equal energy.
Why is it that in the case where the energy of protons ...
user104941
-3
votes
1
answer
71
views
Stability of an atom in absence of EM field
According to Bohr model of atom, electrons move up an energy level in presence of EM field and emit a photon moving down the level.
In complete absence of any external EM field, shouldn't the electron ...
- 63
16
votes
4
answers
5k
views
Why do electrons jump back after absorbing energy and moving to a higher energy level?
Electrons in a shell absorb energy and move to higher energy levels, but they release their energy and jump back to the shell they originally were in. Why do they jump back? Why can they not keep ...
- 189
0
votes
1
answer
129
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Finding excited stage of electron from its potential energy
The potential energy of an electron in the hydrogen atom is $\pu{-6.8 eV}.$ Indicate the excited stage in which electron is present.
Total energy would be equal to $\pu{-3.4 eV}.$
I used the formula
$...
- 412
7
votes
2
answers
4k
views
What are high-energy electrons?
I read that (in cellular respiration) the transported electrons in NADH have a higher energy than those in FADH2.
I can't find a (simple or otherwise) explanation of what a "high-energy" ...
- 267
1
vote
1
answer
251
views
Why does the Heisenberg uncertainty principle work in an atom? [closed]
Where is my logic wrong?
An electron can only assume quantized energies in an atom.
If an electron is localized in space in a hydrogen atom, its radius is known. If its radius is known, its ...
- 21
8
votes
1
answer
337
views
Why is the principal energy of an electron lower for excited electrons in a higher energy state?
Several places state the 'principal energy of an electron' can be calculated as such:
$$E = \frac{2π^2mZ^2e^4}{n^2h^2}$$
Another equation I found was:
$$E = -\frac{E_0}{n^2},$$
where $$E_0 = \pu{...
- 169
2
votes
2
answers
41k
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What is the maximum number of emission lines when the excited electron of a H atom in n = 6 drops to ground state?
When an electron in a higher energy state jumps to a lower energy state in Bohr’s model of hydrogen atom, it emits a photon which has energy equal to the difference in the energy between the final and ...
- 139
7
votes
1
answer
37k
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Formulas for the number of spectral lines
While reading through Narendra Avasthi's Problems in Physical Chemistry, I came across two formulas on p. 64 (Scanned page):
When electrons de-excite from higher energy level ($n_2$) to lower ...
- 167
2
votes
2
answers
1k
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How do flame tests give off color if they only emit the colors when the electrons return to ground state?
Since we are constantly holding the element in the fire and the elements only give off the color when the electrons emit the energy that was supplied and return to ground state, why do we only see the ...
- 803
-1
votes
1
answer
38
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Atoms in Solar Cells
An electric field in solar cells is created through photons knocking electrons off of atoms. What happens to the positively charged atoms once the electrons have been knocked off? Furthermore, are the ...
0
votes
1
answer
236
views
Quantization and Bohr's model
According to quantization it's said that emitted or absorbed energy is quantized.
Then, when it's said in bohr's model an electron changes its orbit (Let's say it goes to a higher energy shell from $...
- 137
1
vote
2
answers
2k
views
Why does a neutral atom of beryllium not have any electrons in a p orbital?
Here's what I understand about quantum number and orbitals, please correct me if anything is wrong:
Electrons enter into these different types of orbitals because they have a higher/lower amount of ...
- 31
3
votes
1
answer
1k
views
Energy levels in non-hydrogen-like atoms
The energy $E_n$ for a hydrogen like atom is given as
$$E_n = -hcR_\ce{H}\frac{Z^2}{n^2}$$
However, aside from on wikipedia where there is
$$E_n = -hcR\frac{Z_\text{eff}^2}{n^2},$$
I can't find ...
- 143
5
votes
2
answers
226
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What prevents everyday objects from reacting?
This may be a stupid question but I would like to know what prevents chemical reactions from happening among common objects in everyday life? The opposite would be, what requirements must be met for ...
