Advertisements
Advertisements
प्रश्न
In 3d series (Sc to Zn), which element has the lowest enthalpy of atomisation and why?
Advertisements
उत्तर
In the 3d series, from Sc to Zn, only zinc has filled valence shells. The valence shell electronic configuration of Zn is 3d104s2. Due to the absence of unpaired electrons in ns and (n–1)d shells, the interatomic electronic bonding is the weakest in zinc. Consequently, zinc has the least enthalpy of atomisation in the 3d series of transition elements.
APPEARS IN
संबंधित प्रश्न
Give reasons:
Transition metals show variable oxidation states.
Compare the stability of +2 oxidation state for the elements of the first transition series.
The transition metals show _________ character because of the presence of unpaired· electrons and Cu+ is ____________ because of its electronic configuration is [Ar]3d10
Two metallic elements A and B have the following standard oxidation potentials: A = 0·40v B = - 0·80v. What would you expect if element A was added to an aqueous salt solution of element B? Give a reason for your answer.
Transition metals with highest melting point is ____________.
In lake test for Al3+ ions, there is the formation of coloured ‘floating lake’. It is due to ______.
The number of terminal oxygen atoms present in the product B obtained from the following reactions is:
\[\ce{FeCr2O4 + Na2CO3 + O2 -> A + Fe2O3 + CO2}\]
\[\ce{A + H^+ -> B + H2O + Na^+}\]
Account for the following:
Ce4+ is a strong oxidising agent.
The given graph shows the trends in melting points of transition metals:
Explain the reason why Cr has the highest melting point and manganese (Mn) has a lower melting point.
Give a reason for the following.
Some transition metals and their compounds get attracted towards the magnetic field.
