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Question: Which element has a larger radius?

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principe:
Okay so I've been taught that Group VIII elements, the inert gases, are ignored when it comes to the periodic table trends. But the TSSM 2007 trial exam suggests that Fluorine has a larger radius than Neon. The question asks to: Rank the following elements in order of atomic size, number 1 being the largest. The elements are Sodium, Neon and Fluorine.
TSSM's response was: Sodium(1), Fluorine(2) and Neon(3)
My answer was: Sodium(1), Neon(2) and Fluorine(3)
Is there like another special rule that I'm missing? Or is it just a misprint? I won't be seeing my Chemistry teacher for a while so yeah.

ninwa:
atom sizes decrease across a period - I think that applies to inert gases too? cos F and Ne have the same no. of shells but Ne has a greater core charge - therefore electrons are more strongly attracted etc

bilgia:
i think im getting confused...dont grp8 elements all have full outershells? how can they attract electrons??

ninwa:

--- Quote from: "bilgia" ---i think im getting confused...dont grp8 elements all have full outershells? how can they attract electrons??
--- End quote ---


no no sorry, i wasn't clear lol, i meant the nucleus of the atom attracts the atom's electrons (electrostatic attraction)

principe:

--- Quote from: "bilgia" ---i think im getting confused...dont grp8 elements all have full outershells? how can they attract electrons??
--- End quote ---

Yeah that's what I've been taught as well. Also, when I did my written report on trends across the periodic table, this site (which seemed pretty reliable), also stated that group 8 elements are unaffected by the atomic radius trend. Example: Argon would be larger than Chlorine.
There was another exam that asked a similar question, which element has the largest atomic radius?, except the elements were Chlorine and Argon. The correct answer was Argon. So it's kind of confusing if the correct responses contradict each other.

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