Anyone know the radius of Hydrogen and the Helium Ion He+...that is with only one electron and using the Bohr atom

yep, here you are;

H- 154 pm

H 78 pm

H+ 10^-5 pm

covalent 30 pm

van der Waals 120 pm

 

He 128 pm

van der Waals 122 pm

He+1 0.93 A...i dont have a key that can type the A with the little circle above it.

furthering my previous post, the reason why He+1 has a lesser atomic radius than H+ is because its effective nuclear charge is greater, because it has more protons "pulling" the electrons.

yep' date=' here you are;

H- 154 pm

H 78 pm

H+ 10^-5 pm

covalent 30 pm

van der Waals 120 pm

 

He 128 pm

van der Waals 122 pm

He+1 0.93 A...i dont have a key that can type the A with the little circle above it.[/quote']

 

78 pm for H sounds like the average value, because the most probable value should be the Bohr radius, which is 52.9 pm.

The norm H =37.1 pm

 

The norm He(1+) = 31 pm

that doesn't sound accurate