Fireman asked in Science & MathematicsPhysics · 1 decade ago

name the elements with half as many electrons in forth shell as compared to it`s third shell?

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  • 1 decade ago
    Favourite answer

    Yttrium

    1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d1

    18: 9

  • 1 decade ago

    Y:

    It has 9 fourth shell electrons(2s+6P+1d) and 18 third shell electrons(2s+6p+10d)

    That is the only one since there are no n=3 f shell(l=3) electron states.

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