Question

Explain the position of actinoids in the periodic table. What is the action of sulphur on lanthanoids?
Calculate the magnetic moment of divalent ion in an aqueous solution of its atomic number 24.

Answer 1

Actinide series 89 to 103 sixth group in the periodic table. series located below lanthanide series which is located below the main body of the periodic table.

Action of sulphur on lanthanoids $\to$ sulphides

$2Ln+3S\to L{n}_2{S}_3$

$M^{2+}$ Atomic no. $24\left[Ar\right]3d^{4}4s^2$

$M^{2+}$ $\left[Ar\right]3d^4$

$n=4$ unpaired

spin magnetic moment $=\sqrt{n(n+2)}$

$=\sqrt{4(4+2)}$

$=\sqrt{24}=4.98BM$