stevemangles Posted July 30, 2004 Posted July 30, 2004 Anyone know the radius of Hydrogen and the Helium Ion He+...that is with only one electron and using the Bohr atom
budullewraagh Posted July 30, 2004 Posted July 30, 2004 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.
budullewraagh Posted July 30, 2004 Posted July 30, 2004 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.
swansont Posted July 30, 2004 Posted July 30, 2004 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.
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