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 aqueous solution it its atomic number is 24.

Explanation

Position of actinoids in periodic table is third group and seventh period.
Action of sulphur on lanthanoids
`2Ln+3S rarr Ln_(2)S_(3)`
Magnetic moment of divalent ion in aqueous solution.
Z = 24, electronic configuration `=[Ar]3d^(5)4S^(1)`
Divalent ion electronic configuration `=[Ar]3d^(4)`
`therefore ` 4 unpaired electrons
Magnetic moment `(mu)=sqrt(x(x+2))B.M.`
`=sqrt(4(4+2))B.M.`
`=4.89B.M.`