00:01
At the idea of nuclear shielding and what effect this has on the trends in atomic radii.
00:05
So within chemistry, the periodicity refers to the repeating trends in the elements in the periodic table.
00:13
So what we can do is draw a small diagram to aid us with this, where we have some shells.
00:29
So the 1s2 and the 2s1.
00:35
So if we use our diagram to help us understand this, so nuclear shield, building, this can be thought of as an electron shell that's partially blocking the positive nuclear charge, that's in the very centre where our protons are.
00:55
So we can imagine the element, for example, lithium, which has a filled shell of two electrons in the first s orbital.
01:03
So that's these electrons, and then the next electron is added to the 2s, which is the largest sphere...