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    What is the electron configuration of Li+?

    ##”Li””^(+): 1s^2##

    Your starting point here will be the of a neutral lithium atom, ##”Li”##.

    A quick look in the will reveal that lithium is located in period 2, group 1, and that it has an equal to ##3##.

    This means that a neutral lithium atom will have a total of ##3## electrons surrounding its nucleus.

    Its will be

    ##”Li: ” 1s^2 color(red)(2)s^1##

    Now, the lithium cation, ##”Li”^(+)##, is formed when lithium loses the electron located on its outermost shell ##->## its . This electron is located on the second energy level, in the 2s-orbital.

    This means that the electron configuration of the ##”Li”^(+)## cation will be

    ##”Li”^(+): 1s^2##

    To write this using , use the electron configuration of the noble gas that comes before lithium in .

    Helium, ##”He”##, has the electron configuration

    ##”He: ” 1s^2##

    This means that you have

    ##”Li”^(+): [“He”]##

    Here the notation ##[“He”]## is meant to represent the electron configuration of helium.

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