Uncertainty principle and hydrogen atom electron

[stickplot]

Homework Statement

Using the uncertainty principle find the energy required for the electron to be confined inside the hydrogen atom. Use the radius of the atom 1 x 10-10 m for Δr. Express your answer in eV, rounded up to the nearest hundredth.

Homework Equations

ΔxΔp$$\geq$$h/4pie
x=position in space
p=momentum

The Attempt at a Solution

is is the radius of the atom=Δx? and if it is how do i get the momentum of the electron?

 

[LowlyPion]

There are other expressions of uncertainty besides ΔxΔp

http://en.wikipedia.org/wiki/Uncertainty_principle#Other_uncertainty_principles