मराठी

Atomic and Physical Properties of Elements of Group 16, 17 and 18

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Estimated time: 7 minutes
Maharashtra State Board: Class 12

Key Points: Atomic and Physical Properties

Atomic Properties:

Property Group 16 Group 17 Group 18
Atomic radius Increases down the group, decreases across the period Increases down the group, decreases across the period Increases down the group, decreases across the period
Ionisation energy Decreases down the group, increases across the period High; decreases down the group Very high
Electronegativity Moderate; decreases down the group Very high; decreases down the group Nearly zero
Electron gain enthalpy Oxygen less negative than sulphur Fluorine less negative than chlorine Positive values
General trend Tendency to gain 2 electrons Tendency to gain 1 electron Stable configuration

Physical Properties:

Property Group 16 Group 17 Group 18
Physical state Oxygen is gas; others are solids Fluorine and chlorine are gases, bromine is a liquid, iodine is a solid All are gases
Nature Non-metals to metal down the group Non-metals Inert gases
Reactivity Moderate Very high Very low
Melting and boiling point Increase down the group Increase down the group Very low values
Special features Show allotropy Show characteristic colours and high reactivity Monoatomic and chemically inert
Examples O, S, Se, Te, Po F, Cl, Br, I, At He, Ne, Ar, Kr, Xe, Rn
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