Home
Class 12
CHEMISTRY
Metal-Metal bonding is more frequent in ...

Metal-Metal bonding is more frequent in 4d or 5d series than in 3d series due to

A

their greater enthelpies of atomisation

B

the larg size of the orbitals which participates in the metal-metal bond formation

C

their ability to involve both ns and (n-1)d electrons in the bond formation

D

the comparable size of 4d and 5d series elements

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question regarding why metal-metal bonding is more frequent in the 4d or 5d series than in the 3d series, we can break down the explanation into clear steps: ### Step-by-Step Solution: 1. **Understanding Metal-Metal Bonding**: - Metal-metal bonding refers to the attractive forces between metal atoms in a metallic structure. The strength of these bonds can vary significantly among different series of transition metals. 2. **Comparing 3d, 4d, and 5d Series**: - The transition metals are divided into different series based on their electron configurations. The 3d series includes elements like Scandium (Sc) to Zinc (Zn), while the 4d series includes Yttrium (Y) to Cadmium (Cd), and the 5d series includes Hafnium (Hf) to Mercury (Hg). 3. **Enthalpy of Atomization**: - The enthalpy of atomization is defined as the energy required to separate one mole of a substance into its individual atoms in the gaseous state. Higher enthalpy of atomization indicates stronger bonds between the atoms in the solid state. 4. **Energy Requirements**: - The 4d and 5d transition metals have higher enthalpies of atomization compared to the 3d transition metals. This is due to their larger atomic size and the presence of additional d-electrons, which contribute to stronger metallic bonding. 5. **Conclusion**: - Because the 4d and 5d series require more energy to break the bonds between the atoms (higher enthalpy of atomization), the metal-metal bonding is stronger and more frequent in these series compared to the 3d series. ### Final Answer: Metal-metal bonding is more frequent in the 4d and 5d series than in the 3d series due to their greater enthalpies of atomization. ---
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • d-BLOCK ELEMENTS

    VK JAISWAL ENGLISH|Exercise ASSERTION-REASON TYPE QUESTIONS|32 Videos

  • d-BLOCK ELEMENTS

    VK JAISWAL ENGLISH|Exercise SUBJECTIVE PROBLEMS|6 Videos

  • CO-ORDINATION COMPOUNDS

    VK JAISWAL ENGLISH|Exercise LEVEL 2|144 Videos

  • ENVIRONMENTAL CHEMISTRY

    VK JAISWAL ENGLISH|Exercise ASSERTION-REASON TYPE QUESTIONS|14 Videos

Similar Questions

Explore conceptually related problems

Explain giving a suitable reason for each of the following : (i) Transition metals and their compounds are generally found to be good catalysts. (ii) Metal-metals bonding is more frequent for the 4d and the 5d series of transitions metals than that for the 3d series.

Explain the following observations about the transition/ inner-transition elements : (i) There is in general an increase in density of elements from titanium (Z=22) to copper (Z=29). (ii) There occurs much more frequent metal-metal bonding in compounds of heavy transition elements (3rd series). (iii) The members in the actinoid series exhibit a large number of oxidation states than the corresponding members in the lanthanoid sereis

(a) Complete the following chemical reaction equations : (i) MnO_(4(aq))^(-) + C_(2)O_(4(aq))^(2-) + H_((aq))^(+) to (ii) Cr_(2) O_(7 (aq))^(2-) + Fe_((aq))^(2+) + H_((aq))^(+) to (b) Explain the following observations about the transition/inner transition elements : (i) There is in general an increase in density of element from titanium (Z = 22) to copper ( Z= 29). (ii) There occurs much more frequent metal-metal bonding in compounds of heavy transition elements ( 3^(rd) series). (iii) The members in the actinoid series exhibit a larger number of oxidation states than the corresponding members in the lanthanoid series.

Incorrect statement for radius of 3d series metal/ions:

State the reason for the following : (i) Cu (I) ion is not stable in an aqueous solution. (ii) Unlike Cr^(3+),Mn^(2+),Fe^(3+) and the subsequent other M^(2+) ions of the 3d series, the 4d and 5d series metals generally do not form stable oxidation states.

Among 3d transition series the IE

Why is enthalpy of atomisation is the lowest for Zn in 3d series of transition elements ?

First IE of 5d seties element are higher than those of 3d and 4d series elements. This is due to:

Assertion : The order of atomic radii of Cu, Ag and Au is Cu lt Ag ~~ Au . Reason : The atomic radii of 4d series elements are larger than those of 3d series elements but generally the radii of 4d and 5d series elements are almost identical.

How would you account for the following : (i) The metallic radii of the third (5d) series of transition metals are virtually the same as those of the corresponding group members of the seconds (4d) series. (ii) There is a greater range of oxidation states among the actinoids than among the lanthanoids.

Home
Profile