Question

1. what is the electron configuration of a mn atom in the ground state? 1s²2s²2p³3s²3p³3d⁷ 1s²2s²2p³3s²3p⁶4s¹3d⁷4p¹ 1s²2s²2p⁶3s²3p⁶4s²3d⁵ 1s²2s²2p⁶3s²

Explanation:

Manganese (Mn) has an atomic number of 25. The electron configuration is determined by filling orbitals in the order of increasing energy (1s < 2s < 2p < 3s < 3p < 4s < 3d).

• For 1s: 2 electrons.
• For 2s: 2 electrons.
• For 2p: 6 electrons.
• For 3s: 2 electrons.
• For 3p: 6 electrons.
• For 4s: 2 electrons (lower energy than 3d when filling initially).
• For 3d: 5 electrons (since \(2 + 2+6 + 2+6 + 2+5=25\)).

Answer:

\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{5}\) (corresponds to the option \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{5}\) in the multiple - choice list)