The lanthanoids
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CHXII08:THE D- & F-BLOCK ELEMENTS

321683 The lanthanoid contraction relates to

1 atomic radius
2 atomic as well as \({{\rm{M}}^{{\rm{3 + }}}}\) radii
3 valence electrons
4 oxidation states
CHXII08:THE D- & F-BLOCK ELEMENTS

321684 Arrange \(\mathrm{Ce}^{3+}, \mathrm{La}^{3+}, \mathrm{Pm}^{3+}\) and \(\mathrm{Yb}^{3+}\) in
increasing order of their ionic radii.

1 \(\mathrm{Yb}^{3+} < \mathrm{Pm}^{3+} < \mathrm{Ce}^{3+} < \mathrm{La}^{3+}\)
2 \(\mathrm{Ce}^{3+} < \mathrm{Yb}^{3+} < \mathrm{Pm}^{3+} < \mathrm{La}^{3+}\)
3 \(\mathrm{Yb}^{3+} < \mathrm{Pm}^{3+} < \mathrm{La}^{3+} < \mathrm{Ce}^{3+}\)
4 \(\mathrm{Pm}^{3+} < \mathrm{La}^{3+} < \mathrm{Ce}^{3+} < \mathrm{Yb}^{3+}\).
CHXII08:THE D- & F-BLOCK ELEMENTS

321685 The atomic and ionic radii ( \(\mathrm{\mathrm{M}^{3+}}\) ions) of Lanthanoid elements decrease with increase in atomic number. This effect is called

1 Lanthanoid contraction
2 Lanthanoid expansion
3 Actinoid contraction
4 Actinoid expansion
CHXII08:THE D- & F-BLOCK ELEMENTS

321686 Lanthanoid contraction is the gradual decrease in size of lanthanoid elements with increase in atomic number. This is due to ineffective shielding of :

1 All the inner shells
2 3f orbitals
3 4f orbitals
4 5f orbitals
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CHXII08:THE D- & F-BLOCK ELEMENTS

321683 The lanthanoid contraction relates to

1 atomic radius
2 atomic as well as \({{\rm{M}}^{{\rm{3 + }}}}\) radii
3 valence electrons
4 oxidation states
CHXII08:THE D- & F-BLOCK ELEMENTS

321684 Arrange \(\mathrm{Ce}^{3+}, \mathrm{La}^{3+}, \mathrm{Pm}^{3+}\) and \(\mathrm{Yb}^{3+}\) in
increasing order of their ionic radii.

1 \(\mathrm{Yb}^{3+} < \mathrm{Pm}^{3+} < \mathrm{Ce}^{3+} < \mathrm{La}^{3+}\)
2 \(\mathrm{Ce}^{3+} < \mathrm{Yb}^{3+} < \mathrm{Pm}^{3+} < \mathrm{La}^{3+}\)
3 \(\mathrm{Yb}^{3+} < \mathrm{Pm}^{3+} < \mathrm{La}^{3+} < \mathrm{Ce}^{3+}\)
4 \(\mathrm{Pm}^{3+} < \mathrm{La}^{3+} < \mathrm{Ce}^{3+} < \mathrm{Yb}^{3+}\).
CHXII08:THE D- & F-BLOCK ELEMENTS

321685 The atomic and ionic radii ( \(\mathrm{\mathrm{M}^{3+}}\) ions) of Lanthanoid elements decrease with increase in atomic number. This effect is called

1 Lanthanoid contraction
2 Lanthanoid expansion
3 Actinoid contraction
4 Actinoid expansion
CHXII08:THE D- & F-BLOCK ELEMENTS

321686 Lanthanoid contraction is the gradual decrease in size of lanthanoid elements with increase in atomic number. This is due to ineffective shielding of :

1 All the inner shells
2 3f orbitals
3 4f orbitals
4 5f orbitals
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CHXII08:THE D- & F-BLOCK ELEMENTS

321683 The lanthanoid contraction relates to

1 atomic radius
2 atomic as well as \({{\rm{M}}^{{\rm{3 + }}}}\) radii
3 valence electrons
4 oxidation states
CHXII08:THE D- & F-BLOCK ELEMENTS

321684 Arrange \(\mathrm{Ce}^{3+}, \mathrm{La}^{3+}, \mathrm{Pm}^{3+}\) and \(\mathrm{Yb}^{3+}\) in
increasing order of their ionic radii.

1 \(\mathrm{Yb}^{3+} < \mathrm{Pm}^{3+} < \mathrm{Ce}^{3+} < \mathrm{La}^{3+}\)
2 \(\mathrm{Ce}^{3+} < \mathrm{Yb}^{3+} < \mathrm{Pm}^{3+} < \mathrm{La}^{3+}\)
3 \(\mathrm{Yb}^{3+} < \mathrm{Pm}^{3+} < \mathrm{La}^{3+} < \mathrm{Ce}^{3+}\)
4 \(\mathrm{Pm}^{3+} < \mathrm{La}^{3+} < \mathrm{Ce}^{3+} < \mathrm{Yb}^{3+}\).
CHXII08:THE D- & F-BLOCK ELEMENTS

321685 The atomic and ionic radii ( \(\mathrm{\mathrm{M}^{3+}}\) ions) of Lanthanoid elements decrease with increase in atomic number. This effect is called

1 Lanthanoid contraction
2 Lanthanoid expansion
3 Actinoid contraction
4 Actinoid expansion
CHXII08:THE D- & F-BLOCK ELEMENTS

321686 Lanthanoid contraction is the gradual decrease in size of lanthanoid elements with increase in atomic number. This is due to ineffective shielding of :

1 All the inner shells
2 3f orbitals
3 4f orbitals
4 5f orbitals
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CHXII08:THE D- & F-BLOCK ELEMENTS

321683 The lanthanoid contraction relates to

1 atomic radius
2 atomic as well as \({{\rm{M}}^{{\rm{3 + }}}}\) radii
3 valence electrons
4 oxidation states
CHXII08:THE D- & F-BLOCK ELEMENTS

321684 Arrange \(\mathrm{Ce}^{3+}, \mathrm{La}^{3+}, \mathrm{Pm}^{3+}\) and \(\mathrm{Yb}^{3+}\) in
increasing order of their ionic radii.

1 \(\mathrm{Yb}^{3+} < \mathrm{Pm}^{3+} < \mathrm{Ce}^{3+} < \mathrm{La}^{3+}\)
2 \(\mathrm{Ce}^{3+} < \mathrm{Yb}^{3+} < \mathrm{Pm}^{3+} < \mathrm{La}^{3+}\)
3 \(\mathrm{Yb}^{3+} < \mathrm{Pm}^{3+} < \mathrm{La}^{3+} < \mathrm{Ce}^{3+}\)
4 \(\mathrm{Pm}^{3+} < \mathrm{La}^{3+} < \mathrm{Ce}^{3+} < \mathrm{Yb}^{3+}\).
CHXII08:THE D- & F-BLOCK ELEMENTS

321685 The atomic and ionic radii ( \(\mathrm{\mathrm{M}^{3+}}\) ions) of Lanthanoid elements decrease with increase in atomic number. This effect is called

1 Lanthanoid contraction
2 Lanthanoid expansion
3 Actinoid contraction
4 Actinoid expansion
CHXII08:THE D- & F-BLOCK ELEMENTS

321686 Lanthanoid contraction is the gradual decrease in size of lanthanoid elements with increase in atomic number. This is due to ineffective shielding of :

1 All the inner shells
2 3f orbitals
3 4f orbitals
4 5f orbitals
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