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Among the elements of lanthanoid series $({}_{58}{Ce} - {}_{71}{Lu})$ , the total number of elements which have odd number of electrons in $f$ -orbitals in their ground state configuration.

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Important Questions on The d- and f-Block Elements

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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

The '

f

' orbitals are half and completely filled, respectively in lanthanide ions [Given : Atomic no.

Eu, 63 : Sm, 62 : Tm, 69; Tb, 65; Yb, 70; Dy, 66

]

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Gadolinium belongs of 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

The third ionization enthalpy is expected to be very low for

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

The elements in which electrons are progressively filled in

4 f

orbital are called

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Number of electrons present in

4 f

orbital of

{Ho}^{3 +}

ion is ________ (Given Atomic No. of

Ho = 67

)

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Which of the following elements have half-filled f-orbitals in their ground state ?
(Given : atomic number $Sm - 62; Eu = 63; Tb = 65; Gd = 64, Pm = 61$ )

Choose the correct answer from the options given below :

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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Which of the following element has one electron in

5 d

-orbital in its electronic configuration?

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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

The pair that has similar atomic radii is:

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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Among the lanthanide

Eu, Tb, Er

and

Dy

, which one readily forms stable divalent ions?

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

The

{Eu}^{2 +}

ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of

Eu = 63

]

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

{Nd}^{2 +} =______

EASY

Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

The correct electronic configuration and spin-only magnetic moment (BM) of

{Gd}^{3 +} (Z = 64),

respectively, are :

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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

The effect of lanthanoid contraction in the lanthanoid series of elements by and large means

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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Gadolinium has a low value of third ionisation enthalpy because of

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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii? (Number in the parenthesis are atomic numbers).

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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Incorrect statement with reference to