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quantum numbers

Posted: Fri Oct 20, 2017 8:04 pm
by Irma Ramos 2I
During lecture today, it was mentioned that the rows of the periodic table correspond to quantum numbers. What exactly does this mean?

Thanks!

Re: quantum numbers  [ENDORSED]

Posted: Fri Oct 20, 2017 9:11 pm
by Mikaila 3E
What this means is that the rows correspond to n. For example, Sodium is in the third row and it is in the 3rd sub-shell thus its electron configuration is [Ne] 3s^1. (The [Ne] is there since Neon is the last noble gas in the previous row) If it is in the second row, the 2nd sub-shell (2s^how ever many electrons) and so forth.

It gets more complicated in the fourth row with the d sub-shell. For example, the fourth row in the periodic table would have the d sub-level a number behind the row it is in. Let's take Arsenic as an example whose electron configuration is [Ar] 4s^2 3d10 4p3. The d sub-shell is 3 while s and p are 4.

Hope this helps!

Re: quantum numbers

Posted: Sun Oct 22, 2017 2:05 pm
by Chloe Blume 1F
What happens to the quantum number as you move across the row?

Re: quantum numbers

Posted: Sun Oct 22, 2017 2:15 pm
by Shanmitha Arun 1L
Elements of the same period share the same principal quantum number. Atoms do not change principal quantum numbers as you move from left to right across the periodic table.

Re: quantum numbers

Posted: Sun Oct 22, 2017 4:11 pm
by JonathanLam1G
Chloe Blume 1F wrote:What happens to the quantum number as you move across the row?


quantum number l changes as you move across certain groups of atoms in a row. The first two columns in a row will be in the s-orbital, so their l = 0. As we move toward the d-orbital (here you will find the metals), l = 2. The p-orbitals will have an l value of 1, and the f-orbitals will have an l value of 3.

Re: quantum numbers

Posted: Sun Oct 22, 2017 10:36 pm
by Ilan Shavolian 1K
what helped me understand was looking at this periodic table with all the electron configurations and testing myself
https://sciencenotes.org/color-periodic ... ions-2015/
the text is pretty small but you can zoom in