a. How many radial nodes are there in the 4s orbital of the hydrogen atom?

b. How many nodal planes are there in a 2𝑝𝑥 orbital of the hydrogen atom?

c. Is the most probable distance from the nucleus of an electron in a 2s orbital larger or smaller than it would be for an electron in a 3s orbital?

d. For the hydrogen atom, list the following orbitals in order of increasing energy (that is, most stable ones first): 4f, 6s, 3d, 1s, 2p.