Atomic radius

[Sonel Raj 3I]

When we look at two elements that aren't particularly located in any extremes on the periodic table (i.e bottom left or top right), how would we be able to determine atomic radius? More specifically, between K and Pb, how would we be able to tell which one is larger and which one is smaller without any actual values, since Pb is a whole two energy levels down, but has three more valence electrons in its outer shell?

Would the horizontal trend concerning atomic radius be more indicative of atomic radius, or vice versa?

[Mackenzie Van Val 3E]

Hi! I would guess that we would use the periodic trend concerning atomic radii to determine which atom has the larger radius. It seems that the atomic radii trend tends to be very consistent across the periodic table, which would probably make it easier to use than looking at the number of valence electrons. I hope this helps!

[Shalyn Kelly 3H]

Hi! I agree with the post above, and if I recall correctly, the horizontal trend is a bit stronger than the vertical. However, I'm unsure if there are any straight up exceptions to the atomic radius trend.

[Moura Girgis 1F]

Hi! I agree with the post above, and if I recall correctly, the horizontal trend is a bit stronger than the vertical. However, I'm unsure if there are any straight up exceptions to the atomic radius trend.

I think Dr. Lavelle might have mentioned these exceptions in his pervious lectures where he discusses trends in the periodic table

[keely_bales_1f]

If you want more clarification for atomic radii, I would look at the period table that Lavelle had put in his lectures. I have attached the link to a similar one below... I hope this helps!
https://www.google.com/url?sa=i&url=htt ... AdAAAAABAJ