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A M^(2+) ion derived from a metal in the...

A `M^(2+)` ion derived from a metal in the first transition metal series has four electrons in `3d` subshell. What element might `M` be?

Text Solution

Verified by Experts

The correct Answer is:
Chromium
`{:(,"Electron configuration of "M^(2+)is:,,[Ar]^(18)4s^(@)3d^(4)),( :.,"Electron configuration of"M is:,,[Ar]^(18)4s^(1)3d^(5)("and not" 5s^(2)3d^(4))):}`
So total number of electrons `= 24`.
Hence, metal `M` is chromium `(Cr)`.
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Knowledge Check

  • A M^(+2) ion derved fromn a metal in the first transition metal series has four electrons in 3d subshell , what element may m be:

    A
    S
    B
    Cr
    C
    Mn
    D
    Se

  • For a transition metal ion having seven electrons in its d-subshell, the magnetic moment will be__________.

    A
    7.98 B.M.
    B
    4.90 B.M.
    C
    3.87 B.M.
    D
    2.83 B.M.

  • Which of the following transition metals of 3d series has the lowest melting point ?

    A
    `Ti(Z= 22)`
    B
    `V(Z= 23)`
    C
    `Cr(Z= 24)`
    D
    `Mn(Z=25)`