Multiple Choice
Which of the following is the correct electron configuration for strontium (Sr)?
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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^5
B
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^4
C
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6
D
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 5s^2
Verified step by step guidance1
Step 1: 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.
Step 2: Recall the order of filling orbitals based on increasing energy: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, etc.
Step 3: Begin filling the orbitals with electrons following the order and the maximum number of electrons each orbital can hold: s (2 electrons), p (6 electrons), d (10 electrons).
Step 4: Write the electron configuration by adding electrons until you reach 36 total electrons, ensuring the last electrons fill the 4p orbital completely (since krypton is a noble gas with a full p subshell).
Step 5: Compare the given options to the correct configuration you wrote, confirming that the correct configuration ends with 4p^6, indicating a full p subshell for krypton.
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