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The incorrect statement among the following is:
- a)Actinoid contraction is greater for element to element than Lanthanoid contraction.
- b)Most of the trivalent Lanthanoid ions are colorless in the solid state.
- c)Lanthanoids are good conductors of heat and electricity.
- d)Actinoids are highly reactive metals, especially when finely divided.
Correct answer is option 'B'. Can you explain this answer?
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The incorrect statement among the following is:a)Actinoid contraction ...
Most of the trivalent Lanthanoid ions are coloured in the solid state.
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The incorrect statement among the following is:a)Actinoid contraction ...
The incorrect statement among the following is: Option B: Most of the trivalent Lanthanoid ions are colorless in the solid state.
Explanation:
Lanthanoids are a group of elements that belong to the f-block of the periodic table. They are also known as rare earth elements. Lanthanoid contraction refers to the decrease in the size of the elements as you move from one element to the next in the lanthanoid series. It is caused by poor shielding of the nuclear charge by the 4f electrons.
a) Actinoid contraction is greater for element to element than Lanthanoid contraction:
The actinoid series is the row of elements below the lanthanoid series in the periodic table. Actinoid contraction is the decrease in size of the elements as you move from one element to the next in the actinoid series. It is greater than lanthanoid contraction because the 5f electrons are less effective in shielding the nuclear charge compared to the 4f electrons.
b) Most of the trivalent Lanthanoid ions are colorless in the solid state:
This statement is incorrect. Trivalent lanthanoid ions are known for their characteristic colors in the solid state. Each lanthanoid element has its own unique color due to the presence of partially filled 4f orbitals which give rise to electronic transitions. For example, europium (Eu3+) ions are red, terbium (Tb3+) ions are green, and samarium (Sm3+) ions are orange.
c) Lanthanoids are good conductors of heat and electricity:
This statement is correct. Lanthanoids are metals and as such, they are good conductors of heat and electricity. They have metallic bonding, which allows for the easy movement of electrons and the transfer of heat and electrical energy.
d) Actinoids are highly reactive metals, especially when finely divided:
This statement is correct. Actinoids are highly reactive metals, especially when they are in a finely divided state. They readily react with air, water, and acids. Some actinoids, such as uranium and plutonium, are known for their radioactive properties and are used in nuclear reactors and weapons.
In conclusion, the incorrect statement among the given options is Option B: Most of the trivalent Lanthanoid ions are colorless in the solid state. Trivalent lanthanoid ions exhibit characteristic colors in the solid state due to the presence of partially filled 4f orbitals.
Explanation:
Lanthanoids are a group of elements that belong to the f-block of the periodic table. They are also known as rare earth elements. Lanthanoid contraction refers to the decrease in the size of the elements as you move from one element to the next in the lanthanoid series. It is caused by poor shielding of the nuclear charge by the 4f electrons.
a) Actinoid contraction is greater for element to element than Lanthanoid contraction:
The actinoid series is the row of elements below the lanthanoid series in the periodic table. Actinoid contraction is the decrease in size of the elements as you move from one element to the next in the actinoid series. It is greater than lanthanoid contraction because the 5f electrons are less effective in shielding the nuclear charge compared to the 4f electrons.
b) Most of the trivalent Lanthanoid ions are colorless in the solid state:
This statement is incorrect. Trivalent lanthanoid ions are known for their characteristic colors in the solid state. Each lanthanoid element has its own unique color due to the presence of partially filled 4f orbitals which give rise to electronic transitions. For example, europium (Eu3+) ions are red, terbium (Tb3+) ions are green, and samarium (Sm3+) ions are orange.
c) Lanthanoids are good conductors of heat and electricity:
This statement is correct. Lanthanoids are metals and as such, they are good conductors of heat and electricity. They have metallic bonding, which allows for the easy movement of electrons and the transfer of heat and electrical energy.
d) Actinoids are highly reactive metals, especially when finely divided:
This statement is correct. Actinoids are highly reactive metals, especially when they are in a finely divided state. They readily react with air, water, and acids. Some actinoids, such as uranium and plutonium, are known for their radioactive properties and are used in nuclear reactors and weapons.
In conclusion, the incorrect statement among the given options is Option B: Most of the trivalent Lanthanoid ions are colorless in the solid state. Trivalent lanthanoid ions exhibit characteristic colors in the solid state due to the presence of partially filled 4f orbitals.
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The incorrect statement among the following is:a)Actinoid contraction is greater for element to element than Lanthanoid contraction.b)Most of the trivalent Lanthanoid ions are colorless in the solid state.c)Lanthanoids are good conductors of heat and electricity.d)Actinoids are highly reactive metals, especially when finely divided.Correct answer is option 'B'. Can you explain this answer?
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