Chemistry

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An atom contains a total of 29 electrons. When the atom is in the ground state how many principle energy levels will contain electrons?
a: 1
b: 2
c: 3
d: 4

How do you figure this out?

  • Chemistry -

    Remember how the orbitals fill.
    1s
    2s 2p
    3s 3p 4s
    3d 4p etc.
    You can have 2 s electrons, 6p electrons, and 10 d electrons.
    So let's add them up.
    1s2 2s2 2p6 3s2 3p6 3d10 4s1
    which gives you 29 electrons; therefore, 4 is the highest principal quantum number.

  • Chemistry -

    thanks

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