All Questions
30
questions
0
votes
1
answer
53
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Perforated Cathode in Anode Ray Experiment
While studying about the anode ray experiment (E. Goldstein), I had a doubt pop up in my head. In the experiment, a perforated cathode has been used. What is the exact reason behind that? Upon ...
- 30.4k
2
votes
1
answer
265
views
Measurement of the number of electrons, protons and neutrons inside an atom
How do we measure the number of protons, electrons, and neutrons inside an atom? What experiments can be conducted to determine, for example, that an iron atom contains 26 protons?
- 41.6k
3
votes
1
answer
7k
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Effective Nuclear Charge of Noble Gases
As stated in my textbook, the effective nuclear charge can be calculated by taking the non-valence electrons away from the atomic number, as also stated in the first calculation on Wikipedia: https://...
- 1
-3
votes
1
answer
288
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Why does the oxygen in NaOH (sodium hydroxide) acquire an electron from the sodium if it's going to become unstable and give away the electron? [closed]
Mind you that the oxygen is already stable, having an even number of electrons and protons? Is the oxygen really neutral when it has an even number of electrons and protons?
- 731
-4
votes
1
answer
237
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why chemical bond between Na and Cl happens [closed]
We know that if Cl and Na get too close, they produce ionic bonding.
Cl has 17 proton and 17 electrons and is considered stable.
Na has 11 protons and 11 electrons and is considered stable.
I ...
- 41.2k
-1
votes
1
answer
65
views
when would copper material have free electrons [closed]
If you imagine a wire of copper(note that I am not talking about electricity at all). Just only a wire of copper or copper metal or whatever full of copper atoms.
We know that each copper atom has 1 ...
- 5,385
-5
votes
1
answer
61
views
Are elements made out of many atoms? [closed]
So im reading a chemistry book right now, and always thought an element is made out of ONE atom, with special properties that make it this element.
Amount of Protons, neutrons and electrons.
But this ...
- 29.2k
1
vote
2
answers
747
views
Does effective nuclear charge decrease down the group?
I've read that the effective nuclear charge increases down the group.
This seems incorrect. As we go down the group the number of protons increases and the shielding constant also increases. We can ...
- 563
1
vote
0
answers
109
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how to make a PEM (proton exchange membrane) out of Nafion Dispersions?
I would like to use a Nafion membrane for a fuel cell project, but the Nafion sheets are hard to integrate. Therefore, I would like a gel type of Nafion that can take the shape of the container I put ...
- 23
1
vote
1
answer
72
views
Thickness of proton exchange membrane (Nafion)?
I am looking into using a proton exchange membrane for a bio-energy cell experiment. Previous scholars have been using Nafion as a PEM to place between the anode and cathode (air-cathode). the ...
4
votes
0
answers
730
views
Did JJ Thomson know about Eugen Goldstein’s experiment discovering canal rays?
We learn that JJ Thomson discovered the electron in 1897. Several years EARLIER in 1886, Eugen Goldstein performs the same experiment but with the anode and cathode switched to produce positively ...
- 26.3k
5
votes
1
answer
1k
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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 ...
- 31.3k
2
votes
4
answers
2k
views
In helium-2, would each electron experience a single positive charge from the nucleus?
If we have an atom of hydrogen-1, we know that there exists one proton with one electron and in helium-2 two protons with two electrons. My question is that do protons get shared equally with ...
- 815
5
votes
1
answer
171
views
Can it be said that on our planet we have roughly the same number of electrons as we have protons?
My question is quite simple I think. Is it true that we have approximately the same number of electrons as we have protons and the average electric charge of the molecules in our planet is roughly ...
- 8,630
10
votes
3
answers
4k
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Why weren't the electrons attracted to doubly charged Helium particles in the Rutherford experiment?
I have a chapter and in it there was a topic on the Rutherford experiment.
It is written that doubly charged helium particles or alpha particles were thrown towards a very thin gold foil and some of ...
