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Identify the incorrect statement among the following: [2007]
- a)Lanthanoid contraction is the accumulation of successive shrinkages.
- b)As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.
- c)Shielding power of 4f electron s is qui te weak.
- d)There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
Correct answer is option 'B'. Can you explain this answer?
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Identify the incorrect statement among the following: [2007]a)Lanthano...
There is a steady decrease in the radii as the atomic number of the lanthanide elements increases. For every additional proton added in nucleus the corresponding electron goes to 4f subshell.
The shape of f -orbitals is very much diffused and they have poor shielding effect. The effective nuclear charge increases which causes the contraction in the size of electron charge cloud. This contraction in size is quite regular and known as Lanthanoid contraction.
Since the change in the ionic radii in the lanthanide series is very small, thus their chemical properties are similar.
The shape of f -orbitals is very much diffused and they have poor shielding effect. The effective nuclear charge increases which causes the contraction in the size of electron charge cloud. This contraction in size is quite regular and known as Lanthanoid contraction.
Since the change in the ionic radii in the lanthanide series is very small, thus their chemical properties are similar.
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Identify the incorrect statement among the following: [2007]a)Lanthano...
Lanthanoid Contraction and Properties of Transition Elements
The correct statement among the given options is option B. Let's understand why this statement is incorrect and look at the other statements for accuracy.
a) Lanthanoid Contraction
Lanthanoid contraction refers to the gradual decrease in the atomic and ionic radii of the lanthanoid elements as one moves across the 4f series from La to Lu. The contraction occurs due to the imperfect shielding of the 4f electrons by the 5s and 5p electrons. This imperfect shielding results in an increase in effective nuclear charge, causing a decrease in the size of the atoms or ions.
b) Similarities between 4d and 5d series
The incorrect statement is option B, which states that the properties of the 4d series of transition elements have no similarities with the 5d series. In reality, the properties of the 4d and 5d series of transition elements do exhibit similarities. This is because both series belong to the d-block of the periodic table and have similar electron configurations.
c) Shielding power of 4f electrons
The shielding power of 4f electrons is indeed weak. The 4f electrons have poor shielding ability due to their shape and distance from the nucleus, resulting in an increase in effective nuclear charge and the lanthanoid contraction.
d) Decrease in radii from La to Lu
As mentioned earlier, there is a decrease in the radii of the atoms or ions as one proceeds from La to Lu. This is a consequence of the lanthanoid contraction, where the imperfect shielding of the 4f electrons leads to an increase in effective nuclear charge and a decrease in size.
In conclusion, the incorrect statement is option B, which states that the properties of the 4d series of transition elements have no similarities with the 5d series. The properties of the 4d and 5d series do exhibit similarities due to their similar electron configurations and belonging to the d-block of the periodic table.
The correct statement among the given options is option B. Let's understand why this statement is incorrect and look at the other statements for accuracy.
a) Lanthanoid Contraction
Lanthanoid contraction refers to the gradual decrease in the atomic and ionic radii of the lanthanoid elements as one moves across the 4f series from La to Lu. The contraction occurs due to the imperfect shielding of the 4f electrons by the 5s and 5p electrons. This imperfect shielding results in an increase in effective nuclear charge, causing a decrease in the size of the atoms or ions.
b) Similarities between 4d and 5d series
The incorrect statement is option B, which states that the properties of the 4d series of transition elements have no similarities with the 5d series. In reality, the properties of the 4d and 5d series of transition elements do exhibit similarities. This is because both series belong to the d-block of the periodic table and have similar electron configurations.
c) Shielding power of 4f electrons
The shielding power of 4f electrons is indeed weak. The 4f electrons have poor shielding ability due to their shape and distance from the nucleus, resulting in an increase in effective nuclear charge and the lanthanoid contraction.
d) Decrease in radii from La to Lu
As mentioned earlier, there is a decrease in the radii of the atoms or ions as one proceeds from La to Lu. This is a consequence of the lanthanoid contraction, where the imperfect shielding of the 4f electrons leads to an increase in effective nuclear charge and a decrease in size.
In conclusion, the incorrect statement is option B, which states that the properties of the 4d series of transition elements have no similarities with the 5d series. The properties of the 4d and 5d series do exhibit similarities due to their similar electron configurations and belonging to the d-block of the periodic table.
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Identify the incorrect statement among the following: [2007]a)Lanthanoid contraction is the accumulation of successive shrinkages.b)As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.c)Shielding power of 4f electron s is qui te weak.d)There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.Correct answer is option 'B'. Can you explain this answer?
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Identify the incorrect statement among the following: [2007]a)Lanthanoid contraction is the accumulation of successive shrinkages.b)As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.c)Shielding power of 4f electron s is qui te weak.d)There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.Correct answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Identify the incorrect statement among the following: [2007]a)Lanthanoid contraction is the accumulation of successive shrinkages.b)As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.c)Shielding power of 4f electron s is qui te weak.d)There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Identify the incorrect statement among the following: [2007]a)Lanthanoid contraction is the accumulation of successive shrinkages.b)As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.c)Shielding power of 4f electron s is qui te weak.d)There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.Correct answer is option 'B'. Can you explain this answer?.
Identify the incorrect statement among the following: [2007]a)Lanthanoid contraction is the accumulation of successive shrinkages.b)As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.c)Shielding power of 4f electron s is qui te weak.d)There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.Correct answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Identify the incorrect statement among the following: [2007]a)Lanthanoid contraction is the accumulation of successive shrinkages.b)As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.c)Shielding power of 4f electron s is qui te weak.d)There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Identify the incorrect statement among the following: [2007]a)Lanthanoid contraction is the accumulation of successive shrinkages.b)As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.c)Shielding power of 4f electron s is qui te weak.d)There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.Correct answer is option 'B'. Can you explain this answer?.
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Identify the incorrect statement among the following: [2007]a)Lanthanoid contraction is the accumulation of successive shrinkages.b)As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.c)Shielding power of 4f electron s is qui te weak.d)There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.Correct answer is option 'B'. Can you explain this answer?, a detailed solution for Identify the incorrect statement among the following: [2007]a)Lanthanoid contraction is the accumulation of successive shrinkages.b)As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.c)Shielding power of 4f electron s is qui te weak.d)There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.Correct answer is option 'B'. Can you explain this answer? has been provided alongside types of Identify the incorrect statement among the following: [2007]a)Lanthanoid contraction is the accumulation of successive shrinkages.b)As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.c)Shielding power of 4f electron s is qui te weak.d)There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.Correct answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
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