ATOMIC THEORY, PERIODIC CLASSIFICATION AND PROPERTIES OF ELEMENT

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Presentation transcript:

ATOMIC THEORY, PERIODIC CLASSIFICATION AND PROPERTIES OF ELEMENT

ATOMIC THEORIES AND MODELS

Dalton’s Atomic Theory

Atomic model of Thomson

Rutherford’s model

Bohr’s model

Quantum Mechanical model

History – classification of Elements Dobereiner- 1829 John Alexander Newland- 1865 Dmitri Mendeleef & Lother Mayer Henry Mosley-1913

Dobereiner triads

Octaves of Newland

Mendeleef’s periodic table

Modern periodic table

Periodic Properties Atomic radius Ionic radius Ionisation Enthalpy Electron Gain Enthalpy Electronegativity Valency Atomic size Covalent radius Vander Waal radius Metallic and non-metallic properties

Atomic radius

Ionic radius Anion Cation

Ionisation Enthalpy

Electron gain Enthalpy

electronegativity

Valency

Atomic size

Periodic Properties

Covalent, Vander Waal & metallic radius

Metallic & Non metallic properties Decreasing metallic character

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