Question

How to find number of unpaired electrons in a compound?

Answer 1

see the valencies of both combining or bonding atoms.
then see attaining nearest noble gas configuration.
and then the electrons left are closed unpaired electrons.
Also other method is Lewis cross and dot structure.
let's take simple example in #image.
there 2 electrons are.unpaired

hope it helps

Answer 2

The number of unpaired electrons in a compound is determined by its electronic configuration.

• To determine the number of unpaired electrons in a compound first we should determine the electronic configuration of the compound.
• Then we have to arrange the electrons in the shells and determine the number of unpaired electrons.
• For example, Na has an electronic configuration
• ${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2}$
• The arrangement of electrons in the shell is as in the image.
• Thus it has one unpaired electron.