00:01
So first of all we have krypton here.
00:03
Okay so krypton that has atomic number 36.
00:09
So the electronic configuration can be written as 1s2, 2 s2 2p6, 3s2 3p6.
00:21
Now 3d 10, 4s2, 4p6.
00:31
Okay, so this means that here we have total of 36 electrons.
00:41
So this question is about iso -electronic species, that means the species which consists of equal number of electrons just like krypton.
00:55
First of all we have br negative.
00:58
Bromene has atomic number 35, so now the electronic configuration will be one 2 s 2 s 2 p 6 3 s 2 3p 6 3d 3d 10 4 s 2 2 and now when i have bromine then it will be 4p 5 but since i have this minus 1 charge so this means 1 electron is gained okay so that's why this will be 4p 6 here in this case 1 electron is gained so that's why there are 36 electrons.
01:44
So yes, this is is electronic to krypton.
01:50
Then we have cl negative.
01:54
So that has 17 atomic number.
01:58
So the electronic configuration will be 1s2, 2s2, 2p6, 3s2, 3p.
02:06
Now when i have 17 atomic number, this means.
02:10
Is 17 electrons so this will be 3p 5 but in this case also we have minus 1 chart so 1 electron is gained so this will be 3p 6 but this makes 18 electrons only so this is not iso electronic then we have i negative so this is iodine here iodine has atomic number 53 so i am writing here the noble gas configuration that is i am writing the electronic configuration in the pattern of noble gas.
02:46
So here this scripton represents electrons up to 36.
02:50
Okay.
02:52
Rest of the electrons are 4d10 5s2, 5p6.
03:01
In this case also one electron is gained.
03:04
So this will be instead of 5p 5, it will be 5p 6.
03:09
Okay...