(a) With reference to Figure 6.18, what is the relationship between the number of nodes in an s orbital and the value of the principal quantum number?
(b) Identify the number of nodes; that is, identify places where the electron density is zero, in the 2px orbital; in the 3s orbital.
(c)What information is obtained from the radial probability functions in Figure 6.18?
(d) For the hydrogen atom, list the following orbital in order of increasing energy: 3s, 2s, 2p, 5s, 4d.

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Most probable distance from nucleus 0.5 Most probable distance from nucleus 3 1 Node Most probable distance from nucleus 7 À 2 Nodes 1s 2s 0 1 2 3 4 5 6 7 8 9 10 Distance from the nucleus, r (A) 1s 0 1 2 3 4 5 6 7 8 9 10 Distance from the nucleus, r (A) 2s 0 1 2 3 4 5 6 7 8 9 10 Distance from the nucleus, r (A) 3s