Solution containing unknown metal cations Add 6 M HCI Precipitate Decantate Group 1 Insoluble chlorides: Remaining cations AgCI, PLCI, Hg,C, Add HS and 0.2 M HCI Decantate Precipitate Group 2 Acid-insoluble sulfides: Cus, CdS, Bi,S, PbS, HgS, As,Sa, Sb,Sa, SnS2 Remaining cations Add (NH,)S at pH = 8 Precipitate Decantate Group 3 Base-insoluble sulfides and hydroxides: Al(OH)2, Fe(OH)a, Cr(OH)2, ZnS, NiS, MnS, Cos Remaining cations Add (NHHPO, and NH3 Precipitate Decantate Group 4 Insoluble phosphates: Caş(PO42, Sra(PO2, Baz(PO42, MGNH,PO4 Group 5 Alkali metal ions and NH,*

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d-Block Elements

According to the modern form of periodic table, 118 elements are present which are subdivided as four blocks, namely, s, p, d and f-block elements based on the entry of the valence electron or last electron into which orbital.