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CHXII08:THE D- & F-BLOCK ELEMENTS

321708 The electronic configurations of $Eu$ (Automic No.63), Gd (atomic No.64) and Tb (Automic No. 65) are:

1

[X e] 4 f^{6} 5 d^{1} 6 s^{2}, [X e] 4 f^{7} 5 d^{1} 6 s^{2}

and

[X e] 4 f^{9} 6 s^{2}

2

[X e] 4 f^{8} 5 d^{1} 6 s^{2}

for all the elements

3

[X e] 4 f^{7} 6 s^{2}, [X e] 4 f^{7} 5 d^{1} 6 s^{2}

and

[X e] 4 f^{9} 5 d^{0} 6 s^{2}

4

[X e] 4 f^{7} 6 s^{2}, [X e] 4 f^{8} 6 s^{2}

and

[X e] 4 f^{9} 5 d^{1} 6 s^{2}

Explanation:

$_{63} E u \to [X e] 4 f^{7} 6 s^{2}$
$_{64} G d \to [X e] 4 f^{7} 5 d^{1} 6 s^{2}$
$_{65} T b \to [X e] 4 f^{9} 5 d^{0} 6 s^{2}$

NEET - 2016

CHXII08:THE D- & F-BLOCK ELEMENTS

321709 Which element from the following lanthanoids has half-filled $f$ -orbitals, in observed and expected electronic configuration?

1

Eu

2

Sm

3

Ce

4

Pm

Explanation:

Europium $({Eu}_{63}) = [Xe] 4 f^{7} 6 s^{2}$

MHTCET - 2021

CHXII08:THE D- & F-BLOCK ELEMENTS

321710 Which of the following elements have half-filled f-orbitals in their ground state?
(Given : atomic numbers $S m = 62; E u = 63; T b = 65$
$G d = 64, P m = 61)$
$\begin{array}{lllll} A. Sm & B. Eu & C. Tb & D. Gd & E. Pm \end{array}$
Choose the correct answer from the options given below:

1 A and B only

2 A and E only

3 B and D only

4 C and D only

Explanation:

Half-filled configuration of f - orbitals will have 7 electrons.
$(A) Sm (62) [Xe] 4 f^{6} 6 s^{2}$
$(B) Eu (63) [Xe] 4 f^{7} 6 s^{2}$
$(C) Tb (65) [Xe] 4 f^{9} 6 s^{2}$
$(D) Gd (64) [Xe] 4 f^{7} 5 d^{1} 6 s^{2}$
$(E) Pm (61) [Xe] 4 f^{5} 6 s^{2}$
Hence, Europium and Gadolinium have halffilled f-subshell.

JEE - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321711 Which of the following lanthanoid has one electron in $6 d$ subshell?

1

La

2

Ce

3

Gd

4 None of these

Explanation:

No lathanoids have electron in $6 d$ subshell.

CHXII08:THE D- & F-BLOCK ELEMENTS

321712 The electronic configuration of cerium is

1

[X e] 4 f^{0} 5 d^{1} 6 s^{2}

2

[X e] 4 f^{1} 5 d^{1} 6 s^{2}

3

[X e] 4 f^{2} 5 d^{0} 6 s^{2}

4 Both (2) and (3)

CHXII08:THE D- & F-BLOCK ELEMENTS

321708 The electronic configurations of $Eu$ (Automic No.63), Gd (atomic No.64) and Tb (Automic No. 65) are:

1

[X e] 4 f^{6} 5 d^{1} 6 s^{2}, [X e] 4 f^{7} 5 d^{1} 6 s^{2}

and

[X e] 4 f^{9} 6 s^{2}

2

[X e] 4 f^{8} 5 d^{1} 6 s^{2}

for all the elements

3

[X e] 4 f^{7} 6 s^{2}, [X e] 4 f^{7} 5 d^{1} 6 s^{2}

and

[X e] 4 f^{9} 5 d^{0} 6 s^{2}

4

[X e] 4 f^{7} 6 s^{2}, [X e] 4 f^{8} 6 s^{2}

and

[X e] 4 f^{9} 5 d^{1} 6 s^{2}

Explanation:

$_{63} E u \to [X e] 4 f^{7} 6 s^{2}$
$_{64} G d \to [X e] 4 f^{7} 5 d^{1} 6 s^{2}$
$_{65} T b \to [X e] 4 f^{9} 5 d^{0} 6 s^{2}$

NEET - 2016

CHXII08:THE D- & F-BLOCK ELEMENTS

321709 Which element from the following lanthanoids has half-filled $f$ -orbitals, in observed and expected electronic configuration?

1

Eu

2

Sm

3

Ce

4

Pm

Explanation:

Europium $({Eu}_{63}) = [Xe] 4 f^{7} 6 s^{2}$

MHTCET - 2021

CHXII08:THE D- & F-BLOCK ELEMENTS

321710 Which of the following elements have half-filled f-orbitals in their ground state?
(Given : atomic numbers $S m = 62; E u = 63; T b = 65$
$G d = 64, P m = 61)$
$\begin{array}{lllll} A. Sm & B. Eu & C. Tb & D. Gd & E. Pm \end{array}$
Choose the correct answer from the options given below:

1 A and B only

2 A and E only

3 B and D only

4 C and D only

Explanation:

Half-filled configuration of f - orbitals will have 7 electrons.
$(A) Sm (62) [Xe] 4 f^{6} 6 s^{2}$
$(B) Eu (63) [Xe] 4 f^{7} 6 s^{2}$
$(C) Tb (65) [Xe] 4 f^{9} 6 s^{2}$
$(D) Gd (64) [Xe] 4 f^{7} 5 d^{1} 6 s^{2}$
$(E) Pm (61) [Xe] 4 f^{5} 6 s^{2}$
Hence, Europium and Gadolinium have halffilled f-subshell.

JEE - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321711 Which of the following lanthanoid has one electron in $6 d$ subshell?

1

La

2

Ce

3

Gd

4 None of these

Explanation:

No lathanoids have electron in $6 d$ subshell.

CHXII08:THE D- & F-BLOCK ELEMENTS

321712 The electronic configuration of cerium is

1

[X e] 4 f^{0} 5 d^{1} 6 s^{2}

2

[X e] 4 f^{1} 5 d^{1} 6 s^{2}

3

[X e] 4 f^{2} 5 d^{0} 6 s^{2}

4 Both (2) and (3)

CHXII08:THE D- & F-BLOCK ELEMENTS

321708 The electronic configurations of $Eu$ (Automic No.63), Gd (atomic No.64) and Tb (Automic No. 65) are:

1

[X e] 4 f^{6} 5 d^{1} 6 s^{2}, [X e] 4 f^{7} 5 d^{1} 6 s^{2}

and

[X e] 4 f^{9} 6 s^{2}

2

[X e] 4 f^{8} 5 d^{1} 6 s^{2}

for all the elements

3

[X e] 4 f^{7} 6 s^{2}, [X e] 4 f^{7} 5 d^{1} 6 s^{2}

and

[X e] 4 f^{9} 5 d^{0} 6 s^{2}

4

[X e] 4 f^{7} 6 s^{2}, [X e] 4 f^{8} 6 s^{2}

and

[X e] 4 f^{9} 5 d^{1} 6 s^{2}

Explanation:

$_{63} E u \to [X e] 4 f^{7} 6 s^{2}$
$_{64} G d \to [X e] 4 f^{7} 5 d^{1} 6 s^{2}$
$_{65} T b \to [X e] 4 f^{9} 5 d^{0} 6 s^{2}$

NEET - 2016

CHXII08:THE D- & F-BLOCK ELEMENTS

321709 Which element from the following lanthanoids has half-filled $f$ -orbitals, in observed and expected electronic configuration?

1

Eu

2

Sm

3

Ce

4

Pm

Explanation:

Europium $({Eu}_{63}) = [Xe] 4 f^{7} 6 s^{2}$

MHTCET - 2021

CHXII08:THE D- & F-BLOCK ELEMENTS

321710 Which of the following elements have half-filled f-orbitals in their ground state?
(Given : atomic numbers $S m = 62; E u = 63; T b = 65$
$G d = 64, P m = 61)$
$\begin{array}{lllll} A. Sm & B. Eu & C. Tb & D. Gd & E. Pm \end{array}$
Choose the correct answer from the options given below:

1 A and B only

2 A and E only

3 B and D only

4 C and D only

Explanation:

Half-filled configuration of f - orbitals will have 7 electrons.
$(A) Sm (62) [Xe] 4 f^{6} 6 s^{2}$
$(B) Eu (63) [Xe] 4 f^{7} 6 s^{2}$
$(C) Tb (65) [Xe] 4 f^{9} 6 s^{2}$
$(D) Gd (64) [Xe] 4 f^{7} 5 d^{1} 6 s^{2}$
$(E) Pm (61) [Xe] 4 f^{5} 6 s^{2}$
Hence, Europium and Gadolinium have halffilled f-subshell.

JEE - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321711 Which of the following lanthanoid has one electron in $6 d$ subshell?

1

La

2

Ce

3

Gd

4 None of these

Explanation:

No lathanoids have electron in $6 d$ subshell.

CHXII08:THE D- & F-BLOCK ELEMENTS

321712 The electronic configuration of cerium is

1

[X e] 4 f^{0} 5 d^{1} 6 s^{2}

2

[X e] 4 f^{1} 5 d^{1} 6 s^{2}

3

[X e] 4 f^{2} 5 d^{0} 6 s^{2}

4 Both (2) and (3)

CHXII08:THE D- & F-BLOCK ELEMENTS

321708 The electronic configurations of $Eu$ (Automic No.63), Gd (atomic No.64) and Tb (Automic No. 65) are:

1

[X e] 4 f^{6} 5 d^{1} 6 s^{2}, [X e] 4 f^{7} 5 d^{1} 6 s^{2}

and

[X e] 4 f^{9} 6 s^{2}

2

[X e] 4 f^{8} 5 d^{1} 6 s^{2}

for all the elements

3

[X e] 4 f^{7} 6 s^{2}, [X e] 4 f^{7} 5 d^{1} 6 s^{2}

and

[X e] 4 f^{9} 5 d^{0} 6 s^{2}

4

[X e] 4 f^{7} 6 s^{2}, [X e] 4 f^{8} 6 s^{2}

and

[X e] 4 f^{9} 5 d^{1} 6 s^{2}

Explanation:

$_{63} E u \to [X e] 4 f^{7} 6 s^{2}$
$_{64} G d \to [X e] 4 f^{7} 5 d^{1} 6 s^{2}$
$_{65} T b \to [X e] 4 f^{9} 5 d^{0} 6 s^{2}$

NEET - 2016

CHXII08:THE D- & F-BLOCK ELEMENTS

321709 Which element from the following lanthanoids has half-filled $f$ -orbitals, in observed and expected electronic configuration?

1

Eu

2

Sm

3

Ce

4

Pm

Explanation:

Europium $({Eu}_{63}) = [Xe] 4 f^{7} 6 s^{2}$

MHTCET - 2021

CHXII08:THE D- & F-BLOCK ELEMENTS

321710 Which of the following elements have half-filled f-orbitals in their ground state?
(Given : atomic numbers $S m = 62; E u = 63; T b = 65$
$G d = 64, P m = 61)$
$\begin{array}{lllll} A. Sm & B. Eu & C. Tb & D. Gd & E. Pm \end{array}$
Choose the correct answer from the options given below:

1 A and B only

2 A and E only

3 B and D only

4 C and D only

Explanation:

Half-filled configuration of f - orbitals will have 7 electrons.
$(A) Sm (62) [Xe] 4 f^{6} 6 s^{2}$
$(B) Eu (63) [Xe] 4 f^{7} 6 s^{2}$
$(C) Tb (65) [Xe] 4 f^{9} 6 s^{2}$
$(D) Gd (64) [Xe] 4 f^{7} 5 d^{1} 6 s^{2}$
$(E) Pm (61) [Xe] 4 f^{5} 6 s^{2}$
Hence, Europium and Gadolinium have halffilled f-subshell.

JEE - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321711 Which of the following lanthanoid has one electron in $6 d$ subshell?

1

La

2

Ce

3

Gd

4 None of these

Explanation:

No lathanoids have electron in $6 d$ subshell.

CHXII08:THE D- & F-BLOCK ELEMENTS

321712 The electronic configuration of cerium is

1

[X e] 4 f^{0} 5 d^{1} 6 s^{2}

2

[X e] 4 f^{1} 5 d^{1} 6 s^{2}

3

[X e] 4 f^{2} 5 d^{0} 6 s^{2}

4 Both (2) and (3)

CHXII08:THE D- & F-BLOCK ELEMENTS

321708 The electronic configurations of $Eu$ (Automic No.63), Gd (atomic No.64) and Tb (Automic No. 65) are:

1

[X e] 4 f^{6} 5 d^{1} 6 s^{2}, [X e] 4 f^{7} 5 d^{1} 6 s^{2}

and

[X e] 4 f^{9} 6 s^{2}

2

[X e] 4 f^{8} 5 d^{1} 6 s^{2}

for all the elements

3

[X e] 4 f^{7} 6 s^{2}, [X e] 4 f^{7} 5 d^{1} 6 s^{2}

and

[X e] 4 f^{9} 5 d^{0} 6 s^{2}

4

[X e] 4 f^{7} 6 s^{2}, [X e] 4 f^{8} 6 s^{2}

and

[X e] 4 f^{9} 5 d^{1} 6 s^{2}

Explanation:

$_{63} E u \to [X e] 4 f^{7} 6 s^{2}$
$_{64} G d \to [X e] 4 f^{7} 5 d^{1} 6 s^{2}$
$_{65} T b \to [X e] 4 f^{9} 5 d^{0} 6 s^{2}$

NEET - 2016

CHXII08:THE D- & F-BLOCK ELEMENTS

321709 Which element from the following lanthanoids has half-filled $f$ -orbitals, in observed and expected electronic configuration?

1

Eu

2

Sm

3

Ce

4

Pm

Explanation:

Europium $({Eu}_{63}) = [Xe] 4 f^{7} 6 s^{2}$

MHTCET - 2021

CHXII08:THE D- & F-BLOCK ELEMENTS

321710 Which of the following elements have half-filled f-orbitals in their ground state?
(Given : atomic numbers $S m = 62; E u = 63; T b = 65$
$G d = 64, P m = 61)$
$\begin{array}{lllll} A. Sm & B. Eu & C. Tb & D. Gd & E. Pm \end{array}$
Choose the correct answer from the options given below:

1 A and B only

2 A and E only

3 B and D only

4 C and D only

Explanation:

Half-filled configuration of f - orbitals will have 7 electrons.
$(A) Sm (62) [Xe] 4 f^{6} 6 s^{2}$
$(B) Eu (63) [Xe] 4 f^{7} 6 s^{2}$
$(C) Tb (65) [Xe] 4 f^{9} 6 s^{2}$
$(D) Gd (64) [Xe] 4 f^{7} 5 d^{1} 6 s^{2}$
$(E) Pm (61) [Xe] 4 f^{5} 6 s^{2}$
Hence, Europium and Gadolinium have halffilled f-subshell.

JEE - 2023

CHXII08:THE D- & F-BLOCK ELEMENTS

321711 Which of the following lanthanoid has one electron in $6 d$ subshell?

1

La

2

Ce

3

Gd

4 None of these

Explanation:

No lathanoids have electron in $6 d$ subshell.

CHXII08:THE D- & F-BLOCK ELEMENTS

321712 The electronic configuration of cerium is

1

[X e] 4 f^{0} 5 d^{1} 6 s^{2}

2

[X e] 4 f^{1} 5 d^{1} 6 s^{2}

3

[X e] 4 f^{2} 5 d^{0} 6 s^{2}

4 Both (2) and (3)

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