Match each set of energy sublevels to the principal energy level that contains them.

s sublevel
s and p sublevel
s, p, and d sublevel

third energy level
first energy level
second energy level

s sublevel : First energy level

s and p sublevel: Second energy level

s, p, and d sublevel: Third energy level

Explanation:

Principle Quantum Numbers : It describes the size of the orbital and the energy level. It is represented by n. Where, n = 1,2,3,4

Azimuthal Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...

1. For n= 1, first energy level

n =1, l can have value 0 to (n-1) i.e. 0 only. Thus l can have only one value of zero which corresponds to s sublevel.

2. For n= 2, second energy level

n=2,  l can have value 0 to (n-1) i.e. 0 and 1 only. l= 0 corresponds to s sublevel and l= 1 corresponds to p sublevel.

3. For n= 3, third energy level

n=3,  l can have value 0 to (n-1) i.e. 0 ,1 and 2 only. l= 0 corresponds to s sublevel , l= 1 corresponds to p sublevel and l= 2 corresponds to d sublevel.

i just learnt this recently but i need to look through my notes again