Question

Explain the magnetic moment of Hg2 +2

Answer 1

$\color{blue}\huge\bold\star\underline\mathfrak{Bonjour\:Mate}\star$

$\color{violet}\huge\bold\star\underline\mathcal{Here\:Is\:Ur\:AnSwer}\star$

$\color{red}\huge\bold\star\underline\mathfrak{Magnetic\:Moment\: of\: Mercury}\star$

Mercury forms two ions; the mercuric ion, Hg++, and the mercurous ion that would be expected to be Hg+, but is [Hg-Hg]++. The electron configuration of Hg is

1s22s22p63s23p63d104s24p64d105s25p64f145d106s2.
For Hg+, the electron configuration should be 5d106s1 with a spin free electron which would make the mercurous compound paramagnetic. However, mercurous compounds are diamagnetic which indicates the absence of any spin free electron [loss of two s electrons not one, to a configuration of d10 (noble gas].This is explained by assuming the formation of a Hg-Hg bond in mercurous compounds, e.g.

Cl-Hg-Hg-Cl   (Hg2++2Cl-)

X-ray analysis of mercurous compounds prove the presence of the Hg-Hg bond in Hg(I) compounds. ( See Inorganic Chemistry for Undergraduates, R. Goplan, University Press 2009, Evidence for the Existence of Hg22+ Aqueous Ion, p. 666.)

$\color{brown}\huge\bold\star\underline\mathfrak{thanks}\star$

Answer 2

Mercury forms two ions; the mercuric ion, Hg++, and the mercurous ion that would be expected to be Hg+, but is [Hg-Hg]++. The electron configuration of Hg is

1s22s22p63s23p63d104s24p64d105s25p64f145d106s2.

For Hg+, the electron configuration should be 5d106s1 with a spin free electron which would make the mercurous compound paramagnetic. However, mercurous compounds are diamagnetic which indicates the absence of any spin free electron [loss of two s electrons not one, to a configuration of d10 (noble gas].This is explained by assuming the formation of a Hg-Hg bond in mercurous compounds, e.g.

Cl-Hg-Hg-Cl (Hg2++2Cl-)

X-ray analysis of mercurous compounds prove the presence of the Hg-Hg bond in Hg(I) compounds. ( See Inorganic Chemistry for Undergraduates, R. Goplan, University Press 2009, Evidence for the Existence of Hg22+ Aqueous Ion, p. 666.