Multiple Choice
Which sublevel is filled immediately after the 5s sublevel in the order of electron filling?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which of the following electron configurations is incorrect?
A
O: 1s^2 2s^2 2p^6
B
Na: 1s^2 2s^2 2p^6 3s^1
C
Cl: 1s^2 2s^2 2p^6 3s^2 3p^5
D
Mg: 1s^2 2s^2 2p^6 3s^2
Verified step by step guidance1
Step 1: Understand that electron configurations represent the distribution of electrons in an atom's orbitals, following the Aufbau principle, Pauli exclusion principle, and Hund's rule.
Step 2: Recall the atomic numbers of the elements given: Oxygen (O) has 8 electrons, Sodium (Na) has 11, Chlorine (Cl) has 17, and Magnesium (Mg) has 12.
Step 3: Write the expected electron configuration for each element based on its atomic number, filling orbitals in order: 1s, 2s, 2p, 3s, 3p, etc.
Step 4: Compare each given configuration to the expected configuration for that element to check for any discrepancies or errors.
Step 5: Identify which configuration does not match the expected electron count or order, marking it as incorrect.
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