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QUESTION

# 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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