question_answer 71)

  .   (a) Electropositive nature of the element (s) increases down the group and decreases across the period. (b) Electronegativity of the element decreases down the group and increases across the period. (c) Atomic size increases down the group and decreases across a period (left to right), (d) Metallic character increases down the group and decreases across a period. On the basis of' the above trends of the periodic table, answer the following about the electron with atomic numbers 3 to 9. (a) Name the most electropositive element among them. (b) Name the most electropositive element. (c) Name of the element with smallest atomic size. (d) Name me element which is a metalloid. (e) Name the element which shows maximum valency.

Answer:

                  The names and symbols of elements having atomic number 3?9 are  

Atomic number	3	4	5	6	7	8	9
Name	Lithium	Beryllium	Boron	Carbon	Nitrogen	Oxygen	Flourine
Symbol	Li	Be	B	C	N	O	F

  (a) Most electronegative element is lithium (Li). (b) Most electronegative element is fluorine (F). (c) Element with smallest atomic size is fluorine (F). (d) Metalloid element re boron (B). (e) Carbon (C) shows maximum valency i.e., 4.