00:01
So we have given here lithium, prancium, sodium and beryllium.
00:13
So first of all, what do we mean by ionization energy? that is the energy required to release the automostal electron, the valence electron.
00:24
So now this ionization energy dependent on nuclear charge, the effective nuclear charge.
00:33
Ionization energy that is directly proportional to effective nuclear charge.
01:02
Okay.
01:03
So now greater the effective nuclear charge, greater will be the ionization energy required.
01:12
How this works? see here, the effective nuclear charge, that is the tendency of nucleus to bind the electrons to it.
01:27
So the more will be the effective nuclear charge, the more will be the tendency of the nucleus to bind the electrons towards itself.
01:35
Okay.
01:36
So that's why the valence shell electrons, the automo shell electrons will be effectively bind together towards the nucleus if the effective nuclear charge is high.
01:48
And this leads to requirement of very high energy so that we can release the electron from the automo shell.
01:56
Okay.
01:58
So now here we have lithium, frangium and sodium.
02:03
So they are from the same group, okay, group first.
02:09
And then we have beryllium that is from group second.
02:12
So we have group first and group.
02:20
Second.
02:26
So now group first, lithium, then we have sodium and then we have frangium.
02:34
And in this we have beryllium...