Atomic number of Mn is 25. Its last electron enters in:
Correct answer: B. 3d
- A. 4p
- B. 3d
- C. 4s
- D. 5d
Explanation
The atomic number of an element tells the number of protons in the nucleus of an atom.For manganese (Mn), with an atomic number of 25, the last electron enters into the electron configuration in the 3d sublevel. The electron configuration for manganese (Mn) is as follows: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵.The last electron, the 25th electron, enters into the 3d sublevel.
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