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 ...
- 99
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?
- 57
-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?
-4
votes
1
answer
237
views
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 ...
- 119
-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 ...
- 119
-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 ...
- 1
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 ...
- 221
1
vote
0
answers
109
views
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 ...
5
votes
1
answer
1k
views
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
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 ...
- 803
4
votes
2
answers
2k
views
Why did J.J. Thomson observe protons in his cathode ray experiment?
In this MIT lecture, at 7:22, the professor says that when J.J. Thomson added a positively charged plate on one side of the cathode ray and a negatively charged plate on the other side, he observed a ...
- 341
1
vote
2
answers
150
views
Can there be any substance whose number of electrons and protons are different at neutral state
I want to ask that if there any substance that has the different number of electrons and protons at its neutral state
- 37
1
vote
2
answers
150
views
Chemistry: A Chemical Dilemma [closed]
We accept that, via observations that an electron possesses a negative charge and a proton a positive charge, both of which attracting each another. My dilemma lies here, what is the reason for the ...
1
vote
0
answers
80
views
Why do objects gain electrons? [duplicate]
I have read that objects gain electrons to become negatively charged and also that they lose electrons to become positively charged. I have also read that same charges repel each other and non-same ...
- 119
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 ...
user53048
1
vote
3
answers
1k
views
Formation of Hydrogen - from a proton and an electron [closed]
If I place a proton and an electron close to each other, can they form an atom of hydrogen? Why or why not? Please explain the scenarios where this is not likely/unlikely.
Personally I doubt it, ...
- 248
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://...
- 1,381
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 ...
- 167
-1
votes
1
answer
170
views
how do protons in the nucleus of an atom overcome repuulsions [duplicate]
Why don't protons present in the nucleus of an atom repel each other being likely charged ?
- 11
5
votes
1
answer
156
views
Comparing energies of isoelectronic species, but one protonated
Let's say we have the following reaction:
$$\ce{RH -> R- + H+}$$
By modelling it using quantum chemical calculations in the gas phase I would make calculations for both $\ce{RH}$ and $\ce{R-}$, ...
- 2,883
3
votes
1
answer
2k
views
If the atomic number is # of protons, why does emission of a beta (electron) particle increase the atomic number?
Atomic number: the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.
Beta emission:
$$\ce{^14_6C -> ^14_7N ...
- 2,853
1
vote
1
answer
995
views
What is the reason why protons and electrons do not collide?
can someone give me an intuitive picture of why electrons don't collide with protons?
I know that electrons move in a sort of cloud, which is our 'orbital', and that they mainly behave like ...
- 153
1
vote
2
answers
1k
views
How do valence shell configurations affect attraction and repulsion forces between atoms? [closed]
It seems clear that the electrons of one atom are attracted to the protons of another and that this is the source of attractive forces between atoms. However, it is not clear why an atom with a full ...
- 259
4
votes
1
answer
19k
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How do scientists count the exact number of electrons, protons, neutrons in the atom? [duplicate]
An atom is very small so it is probably difficult to focus exactly on a single atom. I wonder how scientists count the exact number of electrons, protons, neutrons in an atom of a certain element.
...
- 141
3
votes
1
answer
4k
views
Periodic trends: why is effect of protons greater than electrons?
Why is it that adding protons has a greater effect than electron-electron repulsion on periodic trends like atomic radius and ionization energy (assuming # of shells constant)? It seems that if ...
- 151
2
votes
1
answer
746
views
Can protons be swapped in a chemical reaction?
Can the protons of two elements be swapped in a chemical reaction?
- 21
-3
votes
1
answer
4k
views
Are protons or electrons responsible for the chemistry of an atom? [closed]
Is the question in a correct form? I can't add anything as a comment.
- 111
10
votes
3
answers
4k
views
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 ...
- 301
0
votes
3
answers
5k
views
Is it possible to compress an atom to infinite density? [closed]
I know, by nature, normally atoms are stable. But I wonder, if it is possible to compress an atom, say the Hydrogen atom, to infinite density by applying external force? After all, electrons and ...
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