Chemistry

Question Analysis
This question tests the student's ability to write the shorthand notation for an element, specifically focusing on the transition metals.

Key Concept Explanation
Shorthand notation uses the symbol of a noble gas (in square brackets) to represent the filled inner electron configuration, with only the valence shell configuration written.

Step-by-step Solution
1. Identify the atomic number of manganese, which is 25.
2. Write the full electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁵.
3. Identify the noble gas before manganese, which is argon (Ar, atomic number 18): [Ar].
4. Write the...