Answer
a. n=2 energy level has 4 orbitals.
b. n=4 energy level has 4 sublevels.
c. sublevel 5f has 7 orbitals.
d. sublevel 6p has 3 orbitals.
Work Step by Step
You can find the answer to this question on page 124, topics 'Sublevels' and 'Orbitals'.
a. the n=2 energy level has 2 sublevels ( s with one orbital and p with 3 orbitals) which means level 2 has 4 orbitals (1+3).
figure 4.13 has the number of sublevels and orbitals of the energy levels.