00:01
Okay, so the term shielding of electrons really talks about the electron interaction, the electrostatic interaction between the nucleus, which is a positive charge, and the electrons, which is a negative charge.
00:16
We know that positives and negatives are attracted to each other, but some of these electrons are closer than others.
00:23
So when we talk about lithium, we know that it has a atomic number of three, which means that there are three.
00:33
Three electrons surrounding its nucleus.
00:36
So when we write out the electron configuration, we start with the lowest energy orbital, which is 1s.
00:42
You can put 2 in there.
00:43
And we go to the second lowest, which is 2s...