Fill in the blanks.1. Transition elements occupy the central position

Fill in the blanks.1. Transition elements occupy the central position of the periodic table between ……. elements. 2. Except …… elements, all transition metals are hard and have very high melting point. 3. The metal present in Vitamin – B12 is ……4. …… metal is used in manufacture of artificial joints. 5. The extra stability of Cr and Cu is due to ……. of electrons and exchange energy. 6. Of all the known elements ……. has the highest electrical conductivity at room temperature. 7. The maximum melting point at about the middle of transition metal series indicates that ……configuration is favourable for strong attraction.8. The atomic radius of 5d elements and 4d elements are nearly same due to ……9. Ni (II) compounds are thermodynamically ……. than Pt (II) compounds. 10. The first transition metal ……. exhibits only +3 oxidation state.

Answer»

1. sandpblock

2. group-II

3. cobalt

4. Titanium

5. symmetrical distribution

6. silver

7. d⁵ , inter atomic

8. lanthanoid contraction

9. more stable

10. Scandium