Chemistry

Question Analysis
This question tests the understanding of the concept of ionization energy jumps and the number of valence electrons.

Key Concept Explanation
The position of a sharp increase in ionization energy corresponds to the number of valence electrons. After removing the valence electrons, the next electron is more tightly bound, leading to a significant jump in ionization energy.

Step-by-step Solution
1. A large jump in ionization energy occurs when ionization begins removing core electrons.
2. This happens after all valence electrons are removed.
3. Boron has 3 valence electrons.
4. After removing the first three electrons, the fourth electro...