Question

Fill in the blanks: 

1. If the electronegativity difference between two bonded atoms in a molecule is greater than 1.7, the nature of bonding is ……….. 

2. …………. is the longest period in the periodical table. 

3. ………… forms the basis of modern periodic table.

4. If the distance between two Cl atoms in Cl₂ molecule is 1.98 Å, then the radius of Cl atom is ……….. 

5. Among the given species A^- A⁺ , and A, the smallest one in size is ………. 

6. The scientist who propounded the modern periodic law is ………… 

7. Across the period, ionic radii …………

8. ……….. and ………… are called inner transition elements. 

9. The chief ore of Aluminium is …………. 

10. The chemical name of rust is ………

Answer 1

1. ionic 

2. 6th (sixth) period 

3. Atomic number 

4. 0.99 Å 

5. A⁺ 

6. Dimitri Mendeleev 

7. decreases 

8. Lanthanides, Actinides 

9. bauxite 

10. hydrated ferric oxide