when you prioritize for R/S configuration,

[deleted371318]

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Hi guys,
please help me on how to prioritize for R/S config.
I think there is a specific rule called "Cahn–Ingold–Prelog priority rules" stating that you prioritize atoms according to the substitution of elements with higher atomic numbers.
BUT i saw somewhere you should follow atomic radius trend (increasing as you go down & to the left on PT).
ex) between F vs. N, which one is first?
Can someone clarify this one?
Thanks.

 

[KyoPhan]

Should be atomic number. So N is first.

 

[deleted371318]

If it's according to atomic#, shouldnt it fluorine be first?????

 

[KyoPhan]

If it's according to atomic#, shouldnt it fluorine be first?????

apologies, you are correct

 

[Dotoday]

Definitely Atomic number. Highest Atomic number gets higher priority.

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