Assertion : La(OH)3 is more basic than Lu(OH)3
Reason : Size of Lu3+ increases and shows more covalent character.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false
Lanthanum the first element of lanthanide series has :
only unfilled 3d orbitals
unfilled 3d and 4d orbitals
unfilled 4d and 4forbitals
unfilled 4f and 5d orbitals
Assertion : F- ion is a weak ligand and forms outer orbital complex.
Reason : F- ion cannot force the electrons of d and d orbitals of the inner shell to occupy dxy, dyz and dzx orbitals of the same shell.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
In the periodic table actinides occupy :
III B group in 7th row
III B group in 6th row
III B group in 5th row
None of the above
Why Sc (Z = 21) is not considered as transition element ?
Properties of Sc are similar to alkali metals
3d - orbitals are empty in its stable compound
Stable oxidation number of Sc is +2
Atomic volume of Sc is very large
B.
3d - orbitals are empty in its stable compound
Outer electronic configuration of Sc is 3d1 , 4s2
In the stable oxidation state ie , +3 , the electronic configuration of sc3+ is ;
Sc3+ : 1s2 , 2s2 2p6 , 3s2 3p6 3d0
It shows that 3d subshell is empty transition element can refer to those elements which form atleast one ion with a partially filled d shell of electrons .As Sc3+ has no electrons in its d orbital , hence , it is not considered as transition element in the stricter sense .