Home
Class 12
CHEMISTRY
In the series Sc(Z=21) to Zn(Z=30) the e...

In the series `Sc(Z=21)` to `Zn(Z=30)` the enthalpy of atomisation of zinc is the lowest, i.e., 126 kJ `mol^(-1)`. Why?

Text Solution

Verified by Experts

In the series , Sc to Zn , all elements have one or more unpaired electrons except zinc which has no unpaired electron as its outer electronic configuration is `3d^(10)4s^(2)`. Hence, atomic intermetallic bonding ( metal - metal bonding) is weakest in zinc. Therefore, enthalpy of atomisation is lowest.
Promotional Banner

Topper's Solved these Questions

  • D- AND F-BLOCK ELEMENTS

    PRADEEP|Exercise NCERT EXERCISES|37 Videos

  • D- AND F-BLOCK ELEMENTS

    PRADEEP|Exercise NCERT EXEMPLAR PROBLEMS(MULTIPLE CHOICE QUESTIONS)|21 Videos

  • D- AND F-BLOCK ELEMENTS

    PRADEEP|Exercise NCERT (QUESTIONS AND EXERCISES WITH ANSERS)|10 Videos

  • CORDINATION COMPOUNDS

    PRADEEP|Exercise Important Questions|28 Videos

  • ELECTROCHEMISTRY

    PRADEEP|Exercise IMPORTANT QUESTIONS FOR BOARD EXAMINATION|25 Videos

Similar Questions

Explore conceptually related problems

In 3d series, the enthalpy of atomisation of zinc is the lowest Why?

Assertion : In the series Sc to Zn, the enthalpy of atomisation of zinc is the lowest. Reason : Zinc has greater number of unpaired electrons.

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

Bond dissociation enthalpies of H_(2(g)) and N_(2(g)) are "426.0 kJ mol"^(-1) and "941.8 kJ mol"^(-1) , respectively, and enthalpy of formation of NH_(3(g))" is "-"46 kJ mol"^(-1) . What are the enthalpy of atomisation of NH_(3(g)) and the average bond enthalpy of N-H bond respectively ( in kJ "mol"^(-1) )?

In the 3d series (Sc = 21 to Zn = 30) : (i) Which elements shows maximum number of oxidation states ? (ii) Which elements shows only +3 oxidation state ? (iii) Which elements has the lowest enthalpy of atomization?

(a) Why do transition elements show variable oxidation states? (i) Name the element showing maximum number of oxidation states among the first series of transition metals from Sc (Z = 21) to Zn (Z = 30). (ii) Name the element which shows only + 3 oxidation state. (b) What is lanthanoid contraction? Name an important alloy which contains some of the lanthanoid metals.