Textbook Question
Consider the molecule BF3. (a) What is the electron configuration of an isolated B atom? (b) What is the electron configuration of an isolated F atom?
10. Periodic Properties of the Elements
The Electron Configuration
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Write the electron configuration and electron orbital diagram for the following element:
Mn (Z = 25)
A
1s2 2s2 2p6 3s2 3p6 4s2 3d5
B
1s2 2s2 2p6 3s2 3p6 4s2 4d5
C
1s2 2s2 2p6 3s2 3p6 4s2 3d4
D
1s2 2s2 2p6 3s2 3p6 4s2 3d5
Verified step by step guidance1
Identify the atomic number of manganese (Mn), which is 25. This means Mn has 25 electrons.
Write the electron configuration by filling the orbitals in order of increasing energy: 1s, 2s, 2p, 3s, 3p, 4s, and then 3d.
Distribute the 25 electrons among these orbitals following the Aufbau principle, Pauli exclusion principle, and Hund's rule.
The correct electron configuration for Mn is: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5.
Draw the electron orbital diagram: fill the 1s, 2s, 2p, 3s, 3p, and 4s orbitals completely, then place 5 electrons in the 3d orbitals, ensuring each 3d orbital gets one electron before any pairing occurs.
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