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180 electron rule: Valence shell of a tr...

180 electron rule: Valence shell of a transition metal consists of nine valence orbitals of (n-1) d, ns and np sub-shells, which can accommodate 18 electrons. When a metal complex has 18 valence electrons, it is said to have achieved the same electronic cofiguration as the noble gas at the end of the period. The rule and its exception are similar to the application of the octet rule of main group elements. The rule is not helpful for complexes of the s-block metals, the lanthanides or actinides. Effective atomic number is the total number of electrons possesed by the central possesed by the central metal atom/ion including the electrons contributed by the ligands. It is obvious that if a central transition metal atom/ion achieves 18 electrons in its valence shell, it attains the nearest noble gas cofiguration, which is known as effective atomic numbr (EAN) rule.
[Atomic number :Cr=24, Fe=26, Cu=29, Ni=28, Rh=45]
Which of the following does not obey EAN rule or 18 electron rule ?

A

`[Cr(CO)_(6)]`

B

`[Fe(Ox)_(3)]^(4-)`

C

`[Cu(CN)_(4)]^(3-)`

D

`[Ni(NH_(3))_(6)]^(2+)`

Text Solution

Verified by Experts

The correct Answer is:
D
`[Cr(Co)_(6)] to 24+6xx2=36`
`[Fe(Ox)_(3)]^(-4) to 26-2+4xx3=36`
`[Cu(CN)_(4)]^(3-) to29-1+4xx2=36`
`[Ni(NH_(3))_(6)]^(2+) to 28-2+6xx2=38`
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180 electron rule: Valence shell of a transition metal consists of nine valence orbitals of (n-1) d, ns and np sub-shells, which can accommodate 18 electrons. When a metal complex has 18 valence electrons, it is said to have achieved the same electronic cofiguration as the noble gas at the end of the period. The rule and its exception are similar to the application of the octet rule of main group elements. The rule is not helpful for complexes of the s-block metals, the lanthanides or actinides. Effective atomic number is the total number of electrons possesed by the central possesed by the central metal atom/ion including the electrons contributed by the ligands. It is obvious that if a central transition metal atom/ion achieves 18 electrons in its valence shell, it attains the nearest noble gas cofiguration, which is known as effective atomic numbr (EAN) rule. [Atomic number :Cr=24, Fe=26, Cu=29, Ni=28, Rh=45] The effective atomic number of Rhodium in is :

a total of three shells, with two electrons in its valence shell?

Knowledge Check

  • 180 electron rule: Valence shell of a transition metal consists of nine valence orbitals of (n-1) d, ns and np sub-shells, which can accommodate 18 electrons. When a metal complex has 18 valence electrons, it is said to have achieved the same electronic cofiguration as the noble gas at the end of the period. The rule and its exception are similar to the application of the octet rule of main group elements. The rule is not helpful for complexes of the s-block metals, the lanthanides or actinides. Effective atomic number is the total number of electrons possesed by the central possesed by the central metal atom/ion including the electrons contributed by the ligands. It is obvious that if a central transition metal atom/ion achieves 18 electrons in its valence shell, it attains the nearest noble gas cofiguration, which is known as effective atomic numbr (EAN) rule. [Atomic number :Cr=24, Fe=26, Cu=29, Ni=28, Rh=45] 18 electron rule is applicable to :

    A
    s-block elements
    B
    p-block elements
    C
    d-block elements
    D
    f-block elements

  • 180 electron rule: Valence shell of a transition metal consists of nine valence orbitals of (n-1) d, ns and np sub-shells, which can accommodate 18 electrons. When a metal complex has 18 valence electrons, it is said to have achieved the same electronic cofiguration as the noble gas at the end of the period. The rule and its exception are similar to the application of the octet rule of main group elements. The rule is not helpful for complexes of the s-block metals, the lanthanides or actinides. Effective atomic number is the total number of electrons possesed by the central possesed by the central metal atom/ion including the electrons contributed by the ligands. It is obvious that if a central transition metal atom/ion achieves 18 electrons in its valence shell, it attains the nearest noble gas cofiguration, which is known as effective atomic numbr (EAN) rule. [Atomic number :Cr=24, Fe=26, Cu=29, Ni=28, Rh=45] 18 electron rule is applicable to :

    A
    s-block elements
    B
    p-block elements
    C
    d-block elements
    D
    f-block elements

  • The valence shell electronic configuration of noble gases except helium is

    A
    `ns^(2)np^(3)`
    B
    `ns^(2)np^(4)`
    C
    `ns^(2)np^(5)`
    D
    `ns^(2)np^(6)`

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