What subshells are possible in n = 3 energy level?

223.

Using s, p, d notations describe the orbital with the following quantum numbers :
(a) n = 1, l = 0,
(b) n = 3, l = 1,
(c) n = 4, l = 2,
(d) n = 4, l = 3. 

State and explain Pauli's Exclusion Principle.

Discuss the shapes of s-orbitals.

The bromine atom possesses 35 electrons. It contains 6 electrons in 2p orbital, 6 electrons in 3p orbital and 5 electrons in 4p orbital. Which of these electron experiences the lowest effective nuclear charge?