Question

Which of the following elements has the highest number of valence electrons?

• A. Al
• B. P
• C. Na
• D. Si

Hint:

Valence electrons determine an element’s chemical reactivity. More valence electrons (except noble gases) usually mean higher non-metallic character.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
The number of valence electrons is equal to the group number (for main group elements).
Aluminium (Al): Group 13 → 3 valence electrons.
Phosphorus (P): Group 15 → 5 valence electrons.
Sodium (Na): Group 1 → 1 valence electron.
Silicon (Si): Group 14 → 4 valence electrons.
Step 2: Detailed Explanation:
Among the given elements, phosphorus has the maximum number of valence electrons (5). Step 3: Final Answer:
The element with the highest number of valence electrons is Phosphorus (P).