Question

If $l=1$ for an atom, then the number of orbitals in its sub-shell is:

• A. $1$
• B. $2$
• C. $3$
• D. $0$

Answer 1

The correct option is C $3$

There are total 4 quantum numbers : $n,l,m$ and $s$. $l$ is the angular momentum quantum number. It determines the shape of the orbit.

$l$ ranges from $0to(n-1).$

So the $m$ values can be $-1,0,+1$.

That corresponds to $2px,2py,2pz.$ Those 3 orbitals can each hold 2 electrons.

Hence, option C is correct.