The ground state electronic configuration for boron is 1s²2s²2p¹.In which shell is the last (2p¹)electron? A) K B) M C) L D) N E) O

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The shell labels K, L, M, N, O... correspond to the principal quantum numbers n=1,2,3,4,5... respectively. The last electron in the ground state electronic configuration of boron is in the 2p sub-shell, which falls under n=2. Therefore, the last electron is in the L shell.

The Ground State Electronic Configuration for Boron Is 1s22s22p1

The Ground State Electronic Configuration for Boron Is 1s²2s²2p¹