Question

what is the correct representation for the subshell with n = 2 and l = 1?
2p
1p
1d
2d

Explanation:

To determine the subshell representation, we use the principal quantum number \( n \) (which gives the energy level) and the azimuthal quantum number \( l \) (which determines the subshell type: \( l = 0 \) is \( s \), \( l = 1 \) is \( p \), \( l = 2 \) is \( d \), etc.). Here, \( n = 2 \) and \( l = 1 \) (so the subshell is \( p \)). Thus, the subshell is represented as \( 2p \). The other options are incorrect: \( 1p \) is invalid because \( n = 1 \) can only have \( l = 0 \) (s subshell), \( 1d \) is invalid as \( n = 1 \) can't have \( l = 2 \), and \( 2d \) would require \( l = 2 \) (not \( l = 1 \)).

Answer:

A. 2p