Advertisements
Advertisements
प्रश्न
It has been observed that first ionization energy of 5 d series of transition elements are higher than that of 3d and 4d series, explain why?
Advertisements
उत्तर
The transition elements of 5d series have intervening 4f orbitals. There is greater effective nuclear charge acting on outer valence electrons due to the weak shielding by 4f electrons. Hence first ionisation energy of 5d series of transition elements are higher than that of 3d and 4d series.
APPEARS IN
संबंधित प्रश्न
Why do interstitial compounds have higher melting points than corresponding pure metals?
Calculate magnetic moment of `Fe_((aq))^(2+) ion (Z=26).`
Following are the transition metal ions of 3d series:
Ti4+, V2+, Mn3+, Cr3+
(Atomic numbers: Ti = 22, V = 23, Mn = 25, Cr = 24)
Answer the following:
1) Which ion is most stable in an aqueous solution and why?
2) Which ion is a strong oxidising agent and why?
3) Which ion is colourless and why?
Give reasons: Sc3+ is colourless in aqueous solution whereas Ti3+ is coloured.
In lake test for Al3+ ions, there is the formation of coloured ‘floating lake’. It is due to ______.
The element with atomic number 53 belongs to
Which of the following ions has the maximum magnetic moment?
Which of the following characteristics of transition metals is associated with their catalytic activity?
Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with H2S.
Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:
Ionisation enthalpies
