Multiple Choice
Which of the following best explains how electrons gain energy to move to higher energy levels in the electron cloud?
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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^6
B
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^5
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^3
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, and so on.
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 filled orbital with its superscript indicating the number of electrons, ensuring the total adds up to 36.
Compare the written configuration with the given options to identify the one that correctly represents krypton's electron configuration.
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