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The wave functions for the 1s and 2s orbitals are as follows:

1s ψ = (1/π)^{1/2} (1/a_{0}^{3/2}) exp(–r/a_{0})

2s ψ = (1/32π)^{1/2} (1/a_{0}^{3/2} ) (–2r/a_{0} )exp(–r/a_{0})

where a_{0} is a constant (a_{0} = 53 pm) and r is the distance from the nucleus. Use Microsoft Excel to make a plot of each of these wave functions for values of r ranging from 0 pm to 200 pm. Identify the node in the 2s wave function.

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