Knightwolf

Just to make sure, is atomic radius the same thing as the atomic size??

So it has the greatest atomic radius of all the elements, right?

Umm, the reason I asked about atomic radius is because i think i missed it on my test today and I really want to know if I got it right or not. The question was: Atomic size generally_______ a. increases as you move left to right across the period b. decreases as you move down a group c. remains constant within a period d. decreases as you move left to right across a period I put b. So which one would be correct???

I cant remember whether the atomic radius increases or decreases going across the Periodic Table. And if it increases or decreases going down the periodic table. Help Pls. Also, can someone explain electron affinity to me. Thanks in advance.