Is it Helium or Fluorine? I tried googling it, but it only gave me links to yahoo questions about specific elements. I know the trend for atomic radii is that it increases going down and left, but is there some exception with the Noble Gases?
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incredibly the smallest is Helium because of the good nuclear stress. The electrons in helium are attracted extra beneficial than the hydrogen electron. in case you like a table of the atomic radius right this is one. The atomic radius gets greater in direction of francium and smaller in direction of helium. do not permit those fools trick you by their assumptions. basically because of the fact hydrogen has much less electrons and protons does not mean this is the smallest.
dydx
Hydrogen; all it is is a proton and electron, so there is no nuclear shielding, which allows for maximum interaction and attraction to allow for the smallest atomic radius.
Anonymous
Hydrogen. It's a basic atom.