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Assertion : In transition elements radii...

Assertion : In transition elements radii of 5d series are virtually the same as those of the corresponding members of 4d series.
Reason : The filling of 4f orbitals before 5d orbitals results in regular decrease in atomic radii.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true and reason not is the correct explanation of assertion.

C

If assertion is trun but reason is false.

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
A
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Statement-1: The radii of third (5d) series are vircutally the same as those of the corresoponding members of the second (4d) series. Statement-2: The filling of 4f orbitals before 5d orbitals results I a regular decrease in atomic radii called lathonoid contraction which essentially compensates for the expected increase in atomic size with increasing atomic number.

Read the passage given below and answer the following questions: In transition elements, generally, ions of the same charge in a given series show progressive decrease in radius with increasing atomic number. This is because the new electron enters a d orbital each time the nuclear charge increases by unity. But the radii of the third (5d) series are virtually the same as those of the corresponding members of the second series. This phenomenon is associated with the intervention of the 4f orbitals which must be filled before the 5d series of elements begin. The filling of 4f before 5d orbital results in a regular decrease in atomic radii called Lanthanoid contraction. Following are the transition metal ions of 3d series: Ti^(4+), v^(2+), Mn^(3+), Cr^(3+) (Atomic number: Ti = 22, V = 23, Mn = 25, Cr = 24) Assertion (A): Ti^(4+) ion is colourless. Reason (R): All valence electrons are unpaired in Ti^(4+) ion.

Read the passage given below and answer the following questions: In transition elements, generally, ions of the same charge in a given series show progressive decrease in radius with increasing atomic number. This is because the new electron enters a d orbital each time the nuclear charge increases by unity. But the radii of the third (50) series are virtually the same as those of the corresponding members of the second series. This phenomenon is associated with the intervention of the 4f orbitals which must be filled before the 5d series of elements begin. The filling of 4f before 5d orbital results in a regular decrease in atomic radii called Lanthanoid contraction. Following are the transition metal ions of 3d series: Ti^(4+), V^(2+), Mn^(3+), Cr^(3+) (Atomic number: Ti = 22, V = 23, Mn = 25, Cr = 24) Assertion (A): Among the given ions, Mn^(3+) is the most strong oxidizing agent. Reason (R): Mn^(3+) has an unstable configuration.

The atomic radii of the metals of the third (5d) series of transitions elements are virtually the same as those of the corresponding members of the second (4d) series. Explain.