The electron configurations given below represent excited states. Identify the elements, give their chemical symbols and write their ground state electron configuration.
A. 1s²2s²2p³3s¹
B. [Ar]4s²3d¹⁰4p²5p¹
C. [Kr]5s²4d²5p¹

• A. A) F → [He]2s²2p⁴; B) P → [Ar]4s²3d¹⁰4p³; C) Zr → [Kr]5s²4d²
• B. A) O → [He]2s²2p⁴; B) As → [Ar]4s²3d¹⁰4p³; C) Nb → [Kr]5s²4d³
• C. A) O → [He]2s²2p⁵; B) Sb → [Ar]4s²3d¹⁰4p³; C) Mo → [Kr]5s²4d⁴
• D. A) F → [He]2s²2p⁵; B) As → [Ar]4s²3d¹⁰4p³; C) Nb → [Kr]5s²4d³

Answer: (B)