[ajax0604]

I thought that the atomic radius of hydrogen is less than lithium since it has only one shell occupied by electrons and lithium has two. However, I've seen atomic radii charts that show hydrogen having a very large radius, much larger than lithium. Can someone help explain this?

[Borek]

Atomic radii of different elements are often measured in different ways, so it is quite possible you are comparing apples and oranges.

Do you have links to these charts?

[vansh123]

The radius of lithium is greater, because it has got two more protons (p^+) in its nucleus. Which means that the net positive force in the nucleus of lithium atom is more than the positive force in the hydrogen atom. The effect is that the electrons in the lithium atom are pulled much more towards the centre then in the hydrogen which reduces the radius.   

I hope u understand it.