$d$-block elements form alloys easily because......

  • A
    Their $d$-orbitals are only partially filled.
  • B
    They have a wide variation in atomic size.
  • C
    They have very similar atomic sizes.
  • D
    They are highly electronegative.

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In the ground state of cobalt atom $(Z = 27)$ there are $.......$ unpaired electrons and thus the atom is $.......$

The melting point of $Zn$ is lower as compared to those of the other elements of the $3d$ series because:

Assertion : $E^o$ for $Mn^{3+}/Mn^{2+}$ is more positive than $Cr^{3+}/Cr^{2+}$.
Reason : The third ionization energy of $Mn$ is larger than that of $Cr$.

Why are $Mn^{2+}$ compounds more stable than $Fe^{2+}$ towards oxidation to their $+3$ state?

The outer electronic configuration of $Gd \ (At. \ No. \ 64)$ is

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