1. Are the following transitions is allowed? If not give the reason.

a) Ne 3p¹ => Ne 3s¹

b) Ne 4s¹ => Ne 3s¹

c) ³P_1/2 => ¹S₀

2. What is the term symbols associated with the electron configuration: Ne 3p¹

3. For Na(g), what is the electron configuration of the lowest energy state and what is the term symbol for this state? How many energy level are there for this state in the absence of a magnetic field and in the presence of a magnetic field? What is the electron configuration for the lowest excited state Ne 3p¹and what is the term symbol for this state? Is the transition between these two states allowed and how many lines will be observed for this transition?