Chemistry

Question Analysis
This question tests the understanding of periodic trends in ionization energy, specifically the trend across a period and the presence of anomalies.

Key Concept Explanation
Ionization energy generally increases from left to right across a period due to the increasing nuclear charge and decreasing atomic radius. However, there are anomalies, such as the extra stability of fully filled or half-filled subshells, which can cause deviations from the general trend.

Step-by-step Solution
1. Recall the general trend in ionization energy across a period: it increases from left to right.
2. Consider the presence of anomalies, such as the extra stability of full...