How to write shorthand electron configuration for Florine F?
Another word for shorthand electron configuration is core notation.

Question

How to write shorthand electron configuration for Florine  F?  
Another word for shorthand electron configuration is core notation.

korosh23 · Answer

It seems easy, but do I choose He or Be?
I believe it is He? Can someone help please?  @matt101

korosh23 · Answer

@Somy

somy · Answer

choose the one that is in upper period F belongs to 
meaning if F belongs to period 5
choose the noble gas that is in period 4

somy · Answer

so yea as u believe 
u gotta choose helium

korosh23 · Answer

Ok great and can I ask one more quick question?

korosh23 · Answer

For doing the same thing for uranium, do we choose Lu or Rn? and can you explain how ?

korosh23 · Answer

On the internet I found out that is Rn, but the electron configuration is confusing.
[Rn] 7s^2   5f^3    6d^1
I thought it was [Rn] 7s^2  5f^4  can you explain this to me please?

somy · Answer

thats because Uranium belongs to transition section which is why it gotta get the d orbital filled by 1 to move on to f orbital

korosh23 · Answer

Then why is it seperated? Element down the periodic table in those last two rows are called something else.

somy · Answer

http://prntscr.com/6k55qs

somy · Answer

because its radioactive

korosh23 · Answer

Oh I see and that is why it has to give one electron to d sublevel.  Is it the same thing with all the elements down in those two last rows?

somy · Answer

yep

korosh23 · Answer

Ok thank you for your help! :)

somy · Answer

no probs!