Chemistry

Question Analysis
This question assesses the student's ability to write the shorthand notation for an element using the noble gas core.

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

Step-by-step Solution
1. Identify the atomic number of nickel, which is 28.
2. Write the full electron configuration of nickel: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸.
3. Use the noble gas argon (Ar, atomic number 18) to represent the inner electrons: [Ar].
4. Write the remaining valence shell configurati...