(a) Electropositive nature of the element(s) increases down the group and decreases across the period. Lithium is the most electropositive element.
(b) Electronegativity of the element decreases down the group and increases across the period. Fluorine is the most electronegative element.
(c) Atomic size increases down the group and decreases across a period (left to right). Fluorine is the element with the smallest atomic size among the given elements
(d) Metallic character increases down the group and decreases across a period. Boron is a metalloid.
(e) Carbon is the element that shows maximum valency that is 4.