I. The physical and chemical properties of elements are periodic functions of their electron configuration.
II. Electronegativity of fluroine is less than the electronegativity of chlorine.
III. Electropositive nature decreses from top to bottom in a group.
The correct answer is :
(a) I,II and III are correct.
(b) Only I is correct
(c) Only I and II is correct
(d) Only II and III are correct.