Answer:
For this angular momentum, no quantum number exist
Explanation:
From the question we are told that
The magnitude of the angular momentum is 
The generally formula for Orbital angular momentum is mathematically represented as

Where
is the quantum number
now
We can look at the given angular momentum in this form as

comparing this equation to the generally equation for Orbital angular momentum
We see that there is no quantum number that would satisfy this equation
It is called the atomic number. (In physics it can also be called the proton number)
They are all stable and have eight valence electrons
The answer is more protons than electrons.
Neon has filled its outer shells, therefore it is very stable and does not need to react with other elements and doesn’t form compounds.