Explain why the quantum number set (2, 2, -1, -½) is not possible for an electron in an atom.

Question

jfraser · Answer

the value of l is bouned by (0 - (n-1)). if n=2, l can only be 0 or 1

anonymous · Answer

first no. is the principal quantum no. i.e. n
second one is azimuthal quantum no. i.e denoted by l and is calculated by the formula n-l

clearly, azimuthal quantum no. and the principal quantum no. can't be equal 
that's why the given set of quantum no. can't exist.
the given quantum no. represents an 2d orbital. but n=2 has just an s and a p orbital not a d orbital.
reason is mentioned above.

anonymous · Answer

Wait....so what's the answer?

anonymous · Answer

ans. is the second and the first number can't be equal.
that's y this set is wrong.
y they can't be equal is written above.

anonymous · Answer

the second number written in the bracket has to be less than the first one.

anonymous · Answer

are u still finding some trouble understanding this thing?

anonymous · Answer

No I Got It. Thanks

anonymous · Answer

welcome.!