All Questions
10
questions
-1
votes
2
answers
484
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Why is the d subshell only stable when all of its orbitals are filled? [closed]
I was learning about the Aufbau principle and quantum electronic configuration. Here are some of the yet-unanswered queries that I wish to know the answers to.
I discovered that the d subshell is ...
- 293
7
votes
4
answers
3k
views
How can a neutral atom attract electrons when it's supposed to have zero charge?
A neutral atom is an atom with an equal number of protons and electrons
We know the force of attraction between the proton and electron is equal
and assuming that:
one proton's positive charge ...
- 639
27
votes
1
answer
3k
views
While filling electrons, we follow Aufbau principle, but not while removing them. Why is this so?
I recently came across a question Why is the vanadium(3+) ion paramagnetic?, where the asker is wondering how $\ce{V^{3+}}$ is paramagnetic (he used Aufbau in reverse to remove the electrons), while ...
3
votes
0
answers
137
views
The Hund's Rule [duplicate]
According to hund's rule, electrons must occupy singularly first in the orbitals before pairing up. And if not, the atom would not be stable. Imagine if there are electrons that do not obey Hund's ...
- 45
8
votes
1
answer
12k
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Anomalous Electronic Configuration of Thorium
The electronic configuration of thorium ($Z=90$) is $5\mathrm f^0 6\mathrm d^2 7\mathrm s^2$. But, according to the aufbau principle, the electrons should first enter the $\mathrm f$ subshell and not ...
- 89
0
votes
1
answer
268
views
Can the electron configuration of Te be written that way?
Normally, the electron configuration of Te is known as:
$$\begin{aligned} {[Kr]} 5s^2 \ce{4d^10} 5p^4 \end{aligned}$$
Then, one day I was asked in a exam if this can be written also as:
$$\begin{...
- 167
3
votes
1
answer
612
views
Is my analysis of quantum numbers describing the ground state of At correct?
Which series of quantum numbers describes the highest (energy) occupied orbital in a ground state of At atom?
a) n = 6, l = 0
b) n = 6, l = 2
c) n = 5, l = 2
d) n = 4, l = 3
e) n = 6, l = 1
...
- 167
3
votes
2
answers
24k
views
Ground state electron configuration of chromium [duplicate]
What is the ground state electron configuration of chromium?
Is it $\ce{[Ar]}4s^23d^4$ or
Is it $\ce{[Ar]}4s^13d^5$
- 147
36
votes
3
answers
1.3m
views
What are the maximum number of electrons in each shell?
In my textbook, it says that the maximum number of electrons that can fit in any given shell is given by 2n². This would mean 2 electrons could fit in the first shell, 8 could fit in the second shell, ...
- 597
183
votes
8
answers
173k
views
Can an atom have more than 8 valence electrons? If not, why is 8 the limit?
According to some chemistry textbooks, the maximum number of valence electrons for an atom is 8, but the reason for this is not explained.
So, can an atom have more than 8 valence electrons?
If ...
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