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In general, the configuration of lanthanides is (n – 2) f1-14 (n – 1) s2 p6 d1or 0 ns2. It is observed that, with increase in atomic number of lanthanides, there is a decrease of ionic radii from La : 122 to Lu : 0.99 (Å).
- a)Valence electrons.
- b)Electronegative character
- c)Atomic volume
- d)Nuclear attraction or valence electrons leading to inward shrinking of shells
Correct answer is option 'D'. Can you explain this answer?
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In general, the configuration of lanthanides is (n – 2) f1-14 (n...
Explanation:
Valence Electrons:
The valence electrons of lanthanides are the electrons in the outermost energy level or shell, which is the 5d and 6s orbitals. In the case of lanthanides, the 5d orbitals are more energetic and hence, are filled before the 6s orbitals. The configuration of the outermost energy level for lanthanides is (n-2)f1-14 (n-1)d0-1 ns2. Therefore, the number of valence electrons for lanthanides is 2.
Electronegative Character:
The electronegativity of an element refers to its ability to attract electrons towards itself in a chemical bond. Lanthanides have relatively low electronegativity values. As we move from La to Lu, the atomic number increases, and thus, the electronegativity is expected to decrease.
Atomic Volume:
The atomic volume refers to the amount of space occupied by the atoms of an element. In the case of lanthanides, as we move from La to Lu, the atomic number increases, and the atomic radius decreases. This is due to the increase in effective nuclear charge, which attracts the valence electrons more strongly, leading to a contraction of the atomic radius. As a result, the atomic volume decreases.
Nuclear Attraction or Valence Electrons leading to inward shrinking of shells:
As we move from La to Lu, the atomic number increases, and the positive charge in the nucleus also increases. This increase in nuclear charge leads to a stronger attraction between the nucleus and the valence electrons. The valence electrons are pulled closer to the nucleus, resulting in the inward shrinking of the electron clouds or shells. This leads to a decrease in the atomic radius and an increase in the effective nuclear charge.
In conclusion, the decrease in ionic radii from La to Lu can be attributed to the increase in nuclear attraction or the stronger pull of the nucleus on the valence electrons, which leads to the inward shrinking of the electron clouds or shells.
Valence Electrons:
The valence electrons of lanthanides are the electrons in the outermost energy level or shell, which is the 5d and 6s orbitals. In the case of lanthanides, the 5d orbitals are more energetic and hence, are filled before the 6s orbitals. The configuration of the outermost energy level for lanthanides is (n-2)f1-14 (n-1)d0-1 ns2. Therefore, the number of valence electrons for lanthanides is 2.
Electronegative Character:
The electronegativity of an element refers to its ability to attract electrons towards itself in a chemical bond. Lanthanides have relatively low electronegativity values. As we move from La to Lu, the atomic number increases, and thus, the electronegativity is expected to decrease.
Atomic Volume:
The atomic volume refers to the amount of space occupied by the atoms of an element. In the case of lanthanides, as we move from La to Lu, the atomic number increases, and the atomic radius decreases. This is due to the increase in effective nuclear charge, which attracts the valence electrons more strongly, leading to a contraction of the atomic radius. As a result, the atomic volume decreases.
Nuclear Attraction or Valence Electrons leading to inward shrinking of shells:
As we move from La to Lu, the atomic number increases, and the positive charge in the nucleus also increases. This increase in nuclear charge leads to a stronger attraction between the nucleus and the valence electrons. The valence electrons are pulled closer to the nucleus, resulting in the inward shrinking of the electron clouds or shells. This leads to a decrease in the atomic radius and an increase in the effective nuclear charge.
In conclusion, the decrease in ionic radii from La to Lu can be attributed to the increase in nuclear attraction or the stronger pull of the nucleus on the valence electrons, which leads to the inward shrinking of the electron clouds or shells.
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In general, the configuration of lanthanides is (n – 2) f1-14 (n...
Because of increase in number of electrons in valence shell from La to Lu results of that there is increase in nuclear charge on outermost electrons and hence outermost shell get shrink or inward toword the nucleus and therefore ionic size get decreases from La to Lu
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In general, the configuration of lanthanides is (n – 2) f1-14 (n – 1) s2 p6 d1or 0 ns2. It is observed that, with increase in atomic number of lanthanides, there is a decrease of ionic radii from La : 122 to Lu : 0.99 (Å).a)Valence electrons.b)Electronegative characterc)Atomic volumed)Nuclear attraction or valence electrons leading to inward shrinking of shellsCorrect answer is option 'D'. Can you explain this answer?
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In general, the configuration of lanthanides is (n – 2) f1-14 (n – 1) s2 p6 d1or 0 ns2. It is observed that, with increase in atomic number of lanthanides, there is a decrease of ionic radii from La : 122 to Lu : 0.99 (Å).a)Valence electrons.b)Electronegative characterc)Atomic volumed)Nuclear attraction or valence electrons leading to inward shrinking of shellsCorrect answer is option 'D'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about In general, the configuration of lanthanides is (n – 2) f1-14 (n – 1) s2 p6 d1or 0 ns2. It is observed that, with increase in atomic number of lanthanides, there is a decrease of ionic radii from La : 122 to Lu : 0.99 (Å).a)Valence electrons.b)Electronegative characterc)Atomic volumed)Nuclear attraction or valence electrons leading to inward shrinking of shellsCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In general, the configuration of lanthanides is (n – 2) f1-14 (n – 1) s2 p6 d1or 0 ns2. It is observed that, with increase in atomic number of lanthanides, there is a decrease of ionic radii from La : 122 to Lu : 0.99 (Å).a)Valence electrons.b)Electronegative characterc)Atomic volumed)Nuclear attraction or valence electrons leading to inward shrinking of shellsCorrect answer is option 'D'. Can you explain this answer?.
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