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Can somebody please tell me how to find the orbital notation of an element?
I have no idea how to find the orbital notation of an element. I'm not even sure what it looks like. Please answer quickly because my science teacher is a jerk and expects me to know how to do it or else.
3 Answers
- pisgahchemistLv 77 years agoFavorite Answer
That is what is called the "electron configuration". The basic pattern looks like this:
1s², 2s² 2p⁶, 3s² 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², 4f¹⁴, 5d¹⁰, 6p⁶, 7s² ...
The numbers in front of the s, p, d and f are the principal quantum numbers and tell the major energy level, which is related to the rows in the periodic table. The numbers after the s, p, d and f are actually superscripted, (but since that hard is to do on YA, we'll skip that for later examples.) These simply tell the number of electrons in the sublevel.
The electrons occupy these orbitals in the order given above. It is really dictated by the periodic table
Groups 1 and 2 are occupying s-sublevels
Groups 3-10 (transition metals) are occupying d-sublevels
Groups 11-18 are occupying p-sublevels
The rare-earth metals (lanthanides and actiides) are occupying f-orbitals
The pattern.....
1s2, 2s2 2p6, 3s2 3p6, 4s2, 3d10, 4p6, 5s2, 4d10, 5p6, 6s2, 4f14, 5d10, 6p6, 7s2 ...
is just following the periodic table from left to right, top to bottom from H until you get to the element in question. Another name for that is the "Aufbau principle".
Some electron configurations.
N....1s2, 2s2 2p3
P....1s2, 2s2 2p6, 3s2 3p3
Ca..1s2, 2s2 2p6, 3s2 3p6, 4s2,
Fe..1s2, 2s2 2p6, 3s2 3p6, 4s2, 3d6
Rb..1s2, 2s2 2p6, 3s2 3p6, 4s2, 3d10, 4p6, 5s1
I......1s2, 2s2 2p6, 3s2 3p6, 4s2, 3d10, 4p6, 5s2, 4d10, 5p5
Ba..1s2, 2s2 2p6, 3s2 3p6, 4s2, 3d10, 4p6, 5s2, 4d10, 5p6, 6s2
Pb..1s2, 2s2 2p6, 3s2 3p6, 4s2, 3d10, 4p6, 5s2, 4d10, 5p6, 6s2, 4f14, 5d10, 6p2
A great tool for finding electron configurations is found at http://ptable.com/#Orbital. Just click on the element in the periodic table.
- ?Lv 77 years ago
Orbital notation? Do you mean electron configuration?
There is this list called the aufbau order of how e- fill sublevels in atoms
What looks like exponents are NOT that tells the number of electrons in that sublevel.
1s^2 2s^2 2p^6 3s! is the electron configuration for sodium the sum of electrons is 11 --- the atomic number o sodium.
The beginning number is the energy level, the letter is the sublevel and the number that looks like an exponent is the number of electrons in that sublevel.
Some texts also use boxes to show the breakdown further into orbitals.
sublevel ... number of orbitals ... max. number of electrons.
s ............. 1 (1 box)................... 2
p ................ 3 ( 3 boxes).................... 6
d ................. 5 ( 5 boxes) ............... 10 ...... etc.
Electrons have a 'spin' represented in the box as point up or down.
I'm using u for up arrow and d for down arrow.
so ... ex 2s^2 .... 1st box u ... 2nd box u ... 2 electrons
ex 2... 3s^4 1st box ud 2nd box u 3rd u ... this is because there can be no pairs in an orbital until there is one electron in each.
- plays_poorly...Lv 77 years ago
Try this:
http://www.rsc.org/periodic-table
then click on the element, and it will show you what it is.
Good luck!