All Questions
109
questions
0
votes
1
answer
53
views
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
0
votes
2
answers
125
views
What does "predicted" mean in an electronic configuration?
I've noticed the term "(predicted)" appearing at the end of electron configurations for heavier elements. Could you explain what it signifies and the reason behind it? I haven't been able to ...
- 132
-2
votes
1
answer
59
views
Stability of atoms with 4 valence electrons [closed]
How do atoms with 4 valence electrons stabilize? Do they gain or lose 4 electrons?
This might be a bit of a stupid question, but I'm not sure and I can't find anything online.
2
votes
0
answers
48
views
how can I tell compton versus coherent scatter apart?
I am trying to get a better understanding of compton and coherent scatting, along with all the other interactions. It has seemed like a lot to memorize and I am trying to find ways to more easily ...
- 37
0
votes
1
answer
138
views
Mg2+ ion formation [duplicate]
Why does Mg not form a Mg+1 ion, even though its second ionization energy is much higher than the first ionization energy?
(I know that an ion should resemble the noble gas closest to the element from ...
- 77
-4
votes
2
answers
153
views
How does the same electron orbit both atoms in covalent bond? [closed]
During elementary school chemistry, when they teach about the covalent bond, they say that both atoms need the electron but they can't lose or gain them so they share it.
And for instance they show us ...
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
1
vote
3
answers
146
views
Comparing Succesive Ionisation Energies
I am trying to understand successive ionisation energies. In particular, an explanation for why the second ionisation energy is greater than the first ionisation energy. I'm looking for a clear and ...
7
votes
1
answer
135
views
Confusion about the number of microstates for orbitals
I am very confused about the microstates for a specific orbital.
Let's suppose I have an electronic configuration
$$
\ce{[\dots] 2p^5}
$$
Considering the symmetry of the orbitals and the "...
- 79
-4
votes
1
answer
239
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
-4
votes
1
answer
76
views
what happens to electron after beta minus decay [closed]
In the beta minus decay, electron is emitted from the nucleus. It depends on the previous nuclei(that was before beta decay) how much energy emitted electron will have.
After this event, Internal ...
- 111
-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
752
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
0
votes
0
answers
67
views
Can someone elaborate what it means when its said that electron shells do not exist in multi electron systems?
I'm an undergraduate student in chemistry. I'm trying to grapple with all the new stuff we're learning and making sense of it. Now I want to know if electron shells really "exist" in multi ...
- 29
-3
votes
2
answers
144
views
Why does atomic radius decrease across periods? [closed]
My textbook says that this happens because the number of protons, and thus the total positive charge, increases - a greater attractive force acts on each electron. The book says that this is despite ...
- 63
0
votes
0
answers
60
views
The first electron affinity of an atom
I've read that the first electron affinity is always negative, meaning that energy is always released upon the addition of this first electron. However, I don't think this will apply to noble gases. ...
-2
votes
1
answer
80
views
If you give an electron in a subshell more energy, does it simply "jump" to the next energy level?
Suppose you have an electron in the $\ce{2s}$ subshell of an atom. If energy is given to it, does it simply jump to the next energy level (into the $\ce{3s}$ subshell), or does it move into $\ce{2p}$?
- 193
9
votes
1
answer
723
views
Why does the same electron transition release photons of different frequencies for some elements?
Question: For elements in the same period with different numbers of valance electrons, why does the same electron transition release photons of different frequencies?
Example: For valance electrons ...
- 103
-2
votes
1
answer
127
views
How can Planck’s equation and the wave equation simultaneously coexist with contradicting each other? [closed]
The equations:
E=hf (Planck’s equation, where E is the energy, h is the Planck’s constant and f is the frequency) and
V=fλ (where v is the speed (in a vacuum), f is frequency and λ is the wavelength) ...
- 422
-5
votes
1
answer
74
views
What is the energy difference between inner subshells?
For exemple, in silver the energy difference between the 4d 5s subshells is ≈ 4 eV (in the ultraviolet region, that's why it has no color, etc.), but what is the energy difference between some of its ...
-3
votes
1
answer
533
views
What does it mean when we say an atom has infinite energy levels/shells? [closed]
My chemistry teacher told that an atom has infinite energy shells according to Bohr model , where electron reside according to its angular momentum and energy.
But in lower classes/ grades I have ...
1
vote
1
answer
60
views
What kind of electronic configurations are possible?
Let us take $d^6$ orbital as an example:
A) ↑ | ↑ | ↑ ↓ | ↑ | ↑ |
Now , this one 1 way. My Q is that how is it possible that in the 3rd box , we have a paired electron but not in the 1st one. Like it ...
- 49
1
vote
0
answers
68
views
What happens inside the orbital when energy provided to electron is not sufficient for it to change orbitals? [closed]
While studying the chapter called Atomic Structure, we were introduced with Bohr's model of an Atom. Even though not all of his postulates were right, I believe some were. A doubt arose in the ...
- 101
1
vote
0
answers
361
views
Shielding effect is not constant across a period [closed]
Shielding effect stays constant across a period because number of inner electrons stays the same.
Well, that's not true.
It only works for the period =1,2,3
but in period 4, the number of inner ...
3
votes
3
answers
7k
views
Which atom is the smallest atom?
Is hydrogen or helium the smallest atom? My teacher said that the smallest atom is the helium atom, but I think that the smallest atom is the hydrogen atom. It has a single electron and a single ...
user100905
-5
votes
2
answers
1k
views
What would happen if the alpha particles directly hit the electrons in the gold foil in Rutherford's experiment? [closed]
What would happen if the alpha particles directly hit the electrons in the gold foil in Rutherford's experiment?
Would it get ionized or is there no probability of such a thing happening ?
0
votes
1
answer
387
views
Schrodinger's Equation and Wave Function
So I understand that there exists the shrodinger's equation, which on solving,gives the wave function of an electron. The wave function as I understand, gives all possible information about an ...
-4
votes
1
answer
1k
views
Is this bond Ionic or Covalent, and why? AlBr [closed]
We know a compound could form between NaCl because they are +1 and -1 ions which make them both into a complete valence set.
Could a compound form between Al and Br, for example, and what type of bond ...
- 17
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 ...
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