[libraryofalexandria]

[spookymaincharacter]

day 1 of asexual awareness week:

its been the hardest few hours of my life, i only just managed to push through the hoard of asexuals to rescue my computer that they were all communed around. small traps of cake were laid outside my doors to draw them away, but i know this solution will not work for long and they will come back and aggressively attempt to make me hot chocolate and tell me nice things. im not sure how much more of this i can take, send help. the asexuals are here. be aware

[derpycats]

He was really quite proud of his hair cut.

[vgjunk]

Burger Time, NES.

[sagansense]

[sagansense]

The periodic table of the elements is extremely well organized. It’s a guide that can help you figure out the electronic configuration of an element. 

Like you saw on my previous post, you can find the ”address” of an orbital with 3 quantum numbers : n, ℓ, and m_{ℓ .} 

If you want the address of an electron, giving these 3 quantum numbers will tell you in which orbital the electron is situated. We also know, according to quantum mechanics, that there’s a maximum of 2 electrons per orbital. Plus, according to the Pauli’s exclusion principle, 2 electrons cannot be defined by the same quantum numbers. So, there’s a fourth quantum number, which is m_s which describes the spin of the electron. There’s only two spin authorized : +½ and -½. ( In atomic physics, the spin quantum number is a quantum number that parameterizes the intrinsic angular momentum (or spin angular momentum, or simply spin) of a given particle ) according to my dear friend wikipedia

source

Now, how can you write down the electronic configuration of an atom?

Well one way to do it is with quantum cases + some rules you gotta know. 

First of all this is what a quantum cases look like : 

a arrow = an electron 

an arrow pointing up = spin +½

an arrow pointing down = spin -1/2 

1 case = 1 orbital which means 1 ml right?

Why are some cases sticked together? like 2p^6 for example? Well, because they have the same value of l (which means the same shape of orbital) but they have different values of ml (these same shaped orbitals have different orientations).

When i say 1s², the 1 means n=1 the s means l = 0 and the ² means there’s 2 electrons in that case. Why is there only one case for 1s²? Well simply because there’s only 1 value of ml authorized (which is 0) because l = 0. Remember, if l = something, ml = -something….0…..+something.

So for n = 2, l = 0 or l =1 thats why we have a 2s and a 2p. If l equals 0, then ml = 0 and that’s it, well that’s why theres only 1 case for 2s. If l=1 ml can be equal to -1,0, +1, well thats why there’s 3 cases for 2p. There’s always 3 cases for 2p.

But why do you start with 1s and then 2s and then 2p? Well its because according to the Aufbau principle, we have to fill out the quantum cases starting from those that have the smaller energy. Electrons that have a smaller energy like those in the ”s” subshell for example are more likely to be more attracted to the nucleus than an electron that is in a subshell ”p”. But, if the cases are sticked together, like in 2p^6 all the electrons there have the same ”energy level” which means none of them is more attracted to the nucleus than another one.

For that reason, there’s another rule specially for them ; Hund’s rule ; when you fill out electrons that have the same subshell, you have to place an electron with a spin of +½ first in each cases. 

 For example, the electronic configuration of a carbon atom would look like this:

Drawing quantum cases can be long so you can just write the electronic configuration like this: for example Carbon: 1s² 2s² 2p² .

There’s also some exceptions like for the Cr and Cu atom but im not getting into that. Oh and the hydrogen atom is completely different, partly because he has only 1 proton in his nucleus…

pic1 pic2 pic3 pic4

via subatomiconsciousness

[adestroy]

YEAH KIRK. WHY. 

[sto-vo-kor]

[spatscolombo]

awwwwwkward