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Chemical Properties of Elements of Groups 16, 17 and 18

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Key Points: Chemical Properties

Oxidation States:

Group Common Oxidation States
16 −2, +2, +4, +6
17 −1, +1, +3, +5, +7
18 0 (Xe shows +2, +4, +6)

Reactivity with Hydrogen:

Property Group 16 Group 17
Acidic strength H₂O < H₂S < H₂Se < H₂Te  HF < HCl < HBr < HI 
Thermal stability H₂O > H₂S > H₂Se > H₂Te HF > HCl > HBr > HI
Reducing power H₂S < H₂Se < H₂Te Increases down group

Reactivity with Oxygen:

Group Key Points
16 Forms EO₂, EO₃; acidic oxides; act as oxidising & reducing agents
17 Forms oxides (Cl₂O, Cl₂O₇ etc.); strong oxidising agents

Reactivity with Halogens:

Group Key Points
16 Forms halides (EX₂, EX₄, EX₆)
17 Forms interhalogen compounds 
18 Xe, Kr form fluorides (XeF₂, XeF₄, XeF₆)

Reactivity with Metals:

Group Key Points
16 Forms metal oxides/sulphides (MgSe, CuS)
17 Forms salts (NaCl, MgBr₂)
18 No reaction (inert)

Allotropy:

Element Allotropes
Oxygen O₂, O₃
Sulfur Rhombic, Monoclinic
Selenium Red, Grey
Tellurium Crystalline, Amorphous
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