Chemistry

Question Analysis
This question tests the student's understanding of the special cases in electron configurations, specifically the stability of half-filled d orbitals, and the use of shorthand notation.

Key Concept Explanation
Chromium (atomic number 24) has a special electron configuration where one 4s electron moves to the 3d sublevel to achieve a half-filled 3d sublevel, which is more stable.
The shorthand notation uses the symbol of the nearest noble gas (argon, Ar, atomic number 18) to represent the filled inner electron configuration.

Step-by-step Solution
1. Identify the nearest noble gas: Argon (Ar, atomic number 18).
2. Write the shorthand notation: [Ar].
3. Determine the remaining electrons: 24 - 18 = 6 el...