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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

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  • 7 years ago
    Favorite 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 7
    7 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.

  • 7 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!

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