All Questions
30
questions
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
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
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
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
4
votes
1
answer
19k
views
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
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
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
3
votes
1
answer
7k
views
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
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
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
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
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
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
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
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