Multiple Choice
Which of the following is the correct electron configuration for fluorine (atomic number 9)?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which of the following is the correct electron configuration for krypton (Kr)?
A
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^3
B
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6
C
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^4
D
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^5
Verified step by step guidance1
Identify the atomic number of krypton (Kr), which is 36. This means krypton has 36 electrons to be placed in orbitals according to the Aufbau principle.
Recall the order of filling orbitals based on increasing energy: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, etc.
Distribute the 36 electrons into these orbitals following the Pauli exclusion principle and Hund's rule, filling each orbital to its maximum capacity before moving to the next.
Write the electron configuration by listing each orbital and the number of electrons it contains, ensuring the total adds up to 36.
Compare the given options with the correct configuration you derived, noting that the 4p orbital should be fully filled with 6 electrons for krypton, making the configuration end with 4p^6.
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