Atomic number of Mn is 25 what is the electronic configuration in the ground state________________?
Correct answer: D. 1s2 2s2 2p6 3s2 3p6 4s23d5
- A. 1s2 2s2 2p6 3s2 3p6 3d7
- B. 1s2 2s2 2p6 3s2 3p6 4s2 4p5
- C. 1s2 2s2 2p6 3s2 3p5 3d10
- D. 1s2 2s2 2p6 3s2 3p6 4s23d5
Explanation
Manganese has atomic number 25, so a neutral atom contains 25 electrons. Filling the orbitals gives 1s2 2s2 2p6 3s2 3p6 4s2 3d5, or [Ar] 4s2 3d5. The likely mistake is option a, which has 3d7 and therefore represents the wrong electron count.
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Electronic configuration describes how electrons occupy shells, subshells and orbitals around an atom. Questions use the Aufbau principle, Pauli exclusion principle and Hund's rule to write configurations, identify valence electrons, form ions and explain periodic trends, including common exceptions such as chromium and copper.
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