Question

The elements of a periodic table are given below in the order from left to right. 

Li Be B C O F Ne 

1) To which period do these elements belong? 

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

3) Which one of the elements in this period shows the property of catenation? 

4) Place the three elements fluorine, beryllium, and oxygen in the order of increasing electronegativity. 

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

Answer 1

1. The elements belong to 2nd period. 

2. The element which is missing is Nitrogen which is placed in between carbon and oxygen. 

3. Carbon shows the property of catenation. 

4. The ascending order of electronegativity for these element is Beryllium < Oxygen < Fluorine. 

5. Fluorine belongs to halogen family.