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Chemistry LibreTexts

4.5.1: Practice Electronic Structure

  • Page ID
    236036
  • Exercise \(\PageIndex{1}\)

    Which orbital is the next to fill after the 4s orbital?

    Answer

    3d orbital

    Exercise \(\PageIndex{1}\)

    Which orbital sublevel does NOT exist?

    a)  3d

    b)  4f

    c)  2d

    d)  all exist

    Answer

    c  (The main level 2 only has 2s and 2p sublevels.)

    Exercise \(\PageIndex{1}\)

    How many electrons can fit in the 4d sublevel?

    Answer

    10 electrons

    Exercise \(\PageIndex{1}\)

    Give the electron configuration for each of the following atoms.

    a)  Zn

    b)  K

    c)  Br

    Answer a

    1s2 2s2 2p6 3s2 3p6 4s2 3d10    (total of 30 electrons)

    Answer b

    1s2 2s2 2p6 3s2 3p6 4s1    (total of 19 electrons)

    Answer c

    1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5   (total of 35 electrons)

    Exercise \(\PageIndex{1}\)

    Give the electron configuration for each of the following ions.

    d)  O2–

    e)  K1+

    f)  Br1–

    Answer d

    1s2 2s2 2p6    (total of 10 electrons)

    Answer e

    1s2 2s2 2p6 3s2 3p6    (total of 18 electrons)

    Answer f

    1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6   (total of 36 electrons)

     

     

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