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Assertion : Lanthanoids show a limited o...

Assertion : Lanthanoids show a limited of ixidation states wheres actanoids show a large number of oxidation states.
Reason : Energy gap between `4f, 5d` and `6s` subshells is small wheras that between `5f, 6d` and `7s` subshell is large.

A

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation of Statement -1

B

Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation of Statement-1

C

Statement-1 is True, Statement-2 is false

D

Statement-1 is False, Statement-2is True

Text Solution

Verified by Experts

Statement-2. is False because energy gap beween 4f, 5d and 6s is large whereas that between 5f, 6dand 7s is small.
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Assertion: Manganese shows a number of oxidation states. Reason: The difference of energy between 3d and 4s subshells is large.

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STATEMENT-1 : Lanthanoids show less oxidation states than actinoids and STATEMENT-2: 4f subshell is dieperseated than 5f .

Lanthanoids and actinoids are f-block elements in which the last electron enters the anti-penultimate energy level. The most common oxidation state of lanthanoids is +3, though +2 and +4 oxidation states are exhibited by some of the elements. In lanthanoid series, there is a progressive decrease in atomic and ionic radii, known as lanthanoid contraction. Unlike lanthanoids, actinoids show a large number of oxidation states. Name an element of lanthanoid series, which is known to show +4 oxidation state. Is it a strong oxidising agent or reducing agent?

Lanthanoids and actinoids are f-block elements in which the last electron enters the anti-penultimate energy level. The most common oxidation state of lanthanoids is +3, though +2 and +4 oxidation states are exhibited by some of the elements. In lanthanoid series, there is a progressive decrease in atomic and ionic radii, known as lanthanoid contraction. Unlike lanthanoids, actinoids show a large number of oxidation states. Which is the last element of the actinoid series? Write its electronic configuration.

Statement 1 : Energy gap between 4f, 5d and 6s subshells is small whereas that between 5f, 6d and 7s subshells is large. Statement 2 : Langhanoides show a limited number of oxidation state whereas actinoids show a large number of oxiation states.

Lanthanoids and actinoids are f-block elements in which the last electron enters the anti-penultimate energy level. The most common oxidation state of lanthanoids is +3, though +2 and +4 oxidation states are exhibited by some of the elements. In lanthanoid series, there is a progressive decrease in atomic and ionic radii, known as lanthanoid contraction. Unlike lanthanoids, actinoids show a large number of oxidation states. Name two lanthanoids which exhibit +2 oxidation state.

The transition element ( with few exceptions ) show a large number of oxidation states . The various oxidation states are related to the electronic configuration of their atoms. The variable oxidation states of a transition metal is due to the involvement of (n-1)d and outer ns electrons . For the first five elements of 3d transition series , the minimum oxidation state is equal to the number of electrons in 4s shell and the maximum oxidation state is equal to the sum of 4s and 3d electrons. The relative stability of various oxidation states of a given element can be explained on the basis of stability of d^(0),d^(5) and d^(10) configuration . In 3d series, the maximum oxidation state is shown by