Not sure about atomic radius (1 Viewer)

[Fruitcake05]

http://www.webelements.com/webelements/compounds/text/Li/F1Li1-7789244.html

On this page^, it has a pic of a LiF lattice. The picture says the F atoms are bigger than the Li ones, and I think this is wrong. They are in the same period, except F has more electrons. I think that Li has a larger radius than F because F has more attraction bringing the radius down. Does anyone else think this is wrong?

 

[SDuke]

The site doesnt seem to say that the diagram is in accurate dimension.

But yes u are right, the Li ion has a greater radius compared to the F ion, and thus would appear more bigger if you were trying to draw an accurate model.

As a general rule, radius of atoms in the periodic table DECREASE across the period from LEFT to RIGHT but INCREASE in size down a group.

 

[Fruitcake05]

K thanks.

I'm making a model of the compound (in a lattice), so it have large Li atoms and smaller F atoms?

 

[thunderdax]

But the atoms turn into their ions, and when lithium turns into an ion, it loses its outer shell, meaning it gets smaller. Is this right or am i being a moron?

 

[SDuke]

Now i'm confused

I did a quick sketch of both ions and i agree with you thunderdax, forgot how the Li atom loses it's outer shell.
However i do remember last yr, when drawing structures i followed the general rule, and i didnt have any trouble...soz Fruitcake05

 

[Jumbo Cactuar]

But the atoms turn into their ions, and when lithium turns into an ion, it loses its outer shell, meaning it gets smaller. Is this right or am i being a moron?

Yeah thurderdax is spot on (quoting SI chem data book);

Lithium:
Metallic Li Radius = 152pm
1+ Ionic Radius* = 76pm

Fluorine/fluoride:
Covalent F Radius = 71pm
1- Ionic Radius* = 133pm

* for Coordination Numbers of 6 ie. LiF