why we write 4s 4p and 4d,..why not 5s before 4d..in writing electronic config
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Answer:
Tatasng123, hi.
there is an order in which you read the electronic configuration. It is from top tight to bottom left. Due to this order, 5s cones before 4d. Hope you understood
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This is because filling the subshell configuration obeys n+l rule. Where n is the principal quantum number and l is the azimuthal number l=0 for s; 1 for p; 2 for d&3 for f.
Now
1s. n+l=1+0=1
2s;2
3s=3
And so on
2p n+l=2+1=3 and thus you can find n+l values of all subshells. Those subshells having lower n+l value are filled first. Now if more than one subshell have same n+l value take the one having lower n value. Now taking the case of 4d n+l=4+2=6and that of 5s=5+0=5 so having lower n+l value 5s is filled first
Now
1s. n+l=1+0=1
2s;2
3s=3
And so on
2p n+l=2+1=3 and thus you can find n+l values of all subshells. Those subshells having lower n+l value are filled first. Now if more than one subshell have same n+l value take the one having lower n value. Now taking the case of 4d n+l=4+2=6and that of 5s=5+0=5 so having lower n+l value 5s is filled first
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