Match List I and List II 

1-C; 2-D; 3-B; 4-A

The correct answer is option 1. 1-C; 2-D; 3-B; 4-A.

Let us delve into the electronic configurations of each element:

1. Magnesium (Mg) - Magnesium is a metal with atomic number 12. Its electronic configuration is 2, 8, 2. This means it has 2 electrons in its first energy level (or K shell), 8 electrons in its second energy level (or L shell), and 2 electrons in its third energy level (or M shell).

2. Phosphorus (P) - Phosphorus is a nonmetal with atomic number 15. Its electronic configuration is 2, 8, 5. This means it has 2 electrons in its first energy level, 8 electrons in its second energy level, and 5 electrons in its third energy level.

3. Aluminium (Al) - Aluminium is a metal with atomic number 13. Its electronic configuration is 2, 8, 3. This means it has 2 electrons in its first energy level, 8 electrons in its second energy level, and 3 electrons in its third energy level.

4. Silicon (Si) - Silicon is a metalloid with atomic number 14. Its electronic configuration is 2, 8, 4. This means it has 2 electrons in its first energy level, 8 electrons in its second energy level, and 4 electrons in its third energy level.

These electronic configurations are determined by the number of electrons present in the respective energy levels or electron shells of the atom. The electron configuration provides insights into an element's chemical behavior, including its reactivity and ability to form chemical bonds.