# Explain the Position of Actinoids in the Periodic Table. - Chemistry

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.

#### Solution

Actinoids have a general electronic configuration  5fd-14 6d0-17s2
They are placed at the bottom of periodic table. It follows actinium, Ac = (Z = 89).
i.e., It starts from the seventh period and 3rd group.
2"Ln" +3"S" rightarrow "Ln"_2"S"_3      (Ln is any lanthanoids)
X rightarrow  X2+ +2e-
Electronic Configuration :1s2 2s2 2p63s23p64s13d5
in +2 state : 1s2 2s2 2p63s23p64s03d4

Number of unpaired electron = 4

Magnetic moment (mu) = sqrt(n"("n"+2)) = sqrt(4(4+2)) = sqrt(24) =4.89 B.M

Concept: D-block Elements - General Indroduction
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