Question

The atomic number of an element is 15. Predict

1. the number of valence electrons present in its atom.
2. its valency.
3. its group number.
4. whether it shows metallic or non-metallic properties.
5. the nature of the oxide formed by it.
6. the formula of the chloride.

Answer 1

The element is Phosphorus (P).

Atomic number = 15

Electronic configuration = 2, 8, 5

1. The atom of the element has 5 valence electrons.
2. The valency of the element is 3.
3. The element belongs to Group 15 of the periodic table.
4. The element shows non-metallic properties.
5. The oxide formed by the element is acidic in nature.
6. The formula of the chloride formed by the element is PCl₃.