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Characteristics of p- Block Elements

The configura...

Question

The configuration of $C r$ atom is $3 d^{5} 4 s^{1}$ but not $3 d^{4} 4 s^{2}$ due to reason $R_{1}$ and the configuration of $C u$ atom is $3 d^{10} 4 s^{1}$ but not $3 d^{9} 4 s^{2}$ due to reason $R_{2}$ . $R_{1}$ and $R_{2}$ are_____________.

R_{1}

: The exchange energy of

3 d^{5} 4 s^{1}

is greater than that of

3 d^{4} 4 s^{2}

R_{2}

: The exchange energy of

3 d^{10} 4 s^{1}

is greater than that of

3 d^{9} 4 s^{2}

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R_{1}

3 d^{5} 4 s^{1}

and

3 d^{4} 4 s^{2}

have same exchange energy but

3 d^{5} 4 s^{1}

is spherically symmetrical.

R_{2}

3 d^{10} 4 s^{1}

is also spherically symmetrical.

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R_{1}

3 d^{5} 4 s^{1}

has greater exchange energy than

3 d^{4} 4 s^{2}

R_{2}

3 d^{10} 4 s^{1}

has spherical symmetry.

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R_{1}

3 d^{5} 4 s^{1}

has greater energy than

3 d^{4} 4 s^{2}

R_{2}

3 d^{10} 4 s^{1}

has greater energy than

3 d^{9} 4 s^{2}

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Solution

The correct option is B $R_{1}$ : $3 d^{5} 4 s^{1}$ has greater exchange energy than $3 d^{4} 4 s^{2}$ .
$R_{2}$ : $3 d^{10} 4 s^{1}$ has spherical symmetry.
$3 d^{5} 4 s^{1}$ is correct because it has greater exchange possibilities of unpaired electrons.
Exchange possibilities: $1 - 2, 1 - 3, 1 - 4, 1 - 5$
$(10)$ $2 - 3, 2 - 4, 2 - 5$
$3 - 4, 3 - 5$
$4 - 5$
$3 d^{10} 4 s^{1}$ is correct because $3 d^{10}$ -orbitals are spherically symmetrical.

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Similar questions

Q. Why chromium has electronic configuration

3 d^{5} 4 s^{1}

and not

3 d^{4} 4 s^{2}

?
Transition metals form complex compounds :

Q. Which rule explains the electronic configuration of chromium is [Ar]

3 d^{5} 4 s^{1}

instead of [Ar]

3 d^{4} 4 s^{2}

Q. Assertion :The outer electronic configurations of Cr and Cu are

3 d^{5} 4 s^{1}

and

3 d^{10} 4 s^{1}

respectively. Reason: Electrons are filled in orbitals in order of their increasing energies given by (n+l) rule.

$H_{2}$ $_{(g)}$ + ${C l}_{2}$ $_{(g)}$ $\to$ 2HCl $_{(g)}$ ... rate = $r_{1}$ ; $D_{2}$ $_{(g)}$ + ${C l}_{2}$ $_{(g)}$ $\to$ 2DCl $_{(g)}$ ... rate = $r_{2}$ ; $r_{1}$ = $r_{2}$ . Then the correct statement among the following is

Q. Which one of the following (a or b) electronic configuration is more stable and why?
(a)

3 d^{4} 4 s^{2}

(b)

3 d^{5} 4 s^{1}

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The configuration of Cr atom is 3d54s1 but not 3d44s2 due to reason R1 and the configuration of Cu atom is 3d104s1 but not 3d94s2 due to reason R2. R1 and R2 are_____________.

The configuration of $C r$ atom is $3 d^{5} 4 s^{1}$ but not $3 d^{4} 4 s^{2}$ due to reason $R_{1}$ and the configuration of $C u$ atom is $3 d^{10} 4 s^{1}$ but not $3 d^{9} 4 s^{2}$ due to reason $R_{2}$ . $R_{1}$ and $R_{2}$ are_____________.