Given:
can generally be used to find the electron configuration of an element. There are a few special cases:
1st column, hydrogen + alkali metals:
2nd column, alkaline earth metals:
3rd-12th columns, transition metals:
13th-18th columns, Boron - neon:
Inner transition metals:
Look at the last set of electrons (valence) in your example:
This means the element falls within the column 1: alkali metals. The
This means