How to Write the Orbital Diagram for Lithium (Li)

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To write the orbital diagram for the Lithium atom (Li) first we need to write the electron configuration for just Li. To do that we need to find the number of electrons for the Li atom (there are 3 electrons) using the Periodic Table. When we write the configuration, we'll put all 3 electrons in orbitals around the nucleus of the Lithium atom.

Either way, the Lithium electron configuration will be 1s2 2s1 .

Once we have this information we can then place electrons in an orbital diagram for Lithium. Note that we are making the Atomic Orbital Diagram for Li (not a molecular orbital diagram).

The configuration notation and atomic orbital diagram provides an easy way for scientists to write and communicate how electrons are arranged around the nucleus of an atom. This makes it easier to understand and predict how atoms will interact to form chemical bonds.
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rehan