Question

The elements of one short period of the Periodic Table are given below in order from left to right :

Li Be B C O F Ne

(a) To which period do these elements belong ?

(b) One element of this period is missing. Which is the missing element and where should it be placed ?

(c) Place the three elements fluorine , beryllium and nitrogen in the order of increasing electronegativity.

(d) Which one of the above elements belongs to the halogen series ?

Answer 1

(a) second period

(b) nitrogen (N) is missing. This element should be placed between carbon and oxygen

(c) beryllium, nitrogen and fluorine

(d) fluorine (F).