Chemistry

Question Analysis
This question tests the understanding of periodic trends in ionization energy, specifically how it changes across a period.

Key Concept Explanation
Ionization energy generally increases from left to right across a period due to the increasing nuclear charge and decreasing atomic radius, which strengthens the attraction for valence electrons.

Step-by-step Solution
1. Identify the elements: Sodium (Na), Magnesium (Mg), Aluminum (Al), and Silicon (Si).
2. Determine their positions in the periodic table: Na (Group 1A), Mg (Group 2A), Al (Group 3A), Si (Group 4A).
3. Apply the periodic trend: Ionization energy increa...