Atomic structure - Theories

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Atomic structure - different theories - Chemistry

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1. Atomic Structure : www.saitechinfo.com 1. Atomic Structure Chemistry STD 10 Matriculation Board

Contents : www.saitechinfo.com Contents Atomic Hypothesis Constituents of the atom Quantum numbers Electronic configuration of atoms of elements Shape of Orbital Electronic concept of oxidation and reduction Oxidation number

Slide 3 : www.saitechinfo.com Dalton’s Model J.J. Thomson Model Rutherford’s model Bohr’s model Sommerfeld model Quantum mechanical model Concept of atomic model Difference between an orbit and orbital 1. Atomic Hypothesis

Slide 4 : www.saitechinfo.com Dalton’s Model 1. Atomic Hypothesis Atoms are indivisible tomia’ means divisible ‘Atomia’ means indivisible Chalk piece Broken into pieces Further powdered Atom A tiniest particle Which cannot be divided further

Slide 5 : www.saitechinfo.com J.J. Thomson Model 1. Atomic Hypothesis An atom is a solid sphere of positively charged particles in which electrons are embedded like seeds in a watermelon fruit Water melon Electrons embedded

Slide 6 : www.saitechinfo.com Rutherford’s model 1. Atomic Hypothesis The protons and neutrons are present in a small dense positively charged core called nucleus and all the electrons revolve around the nucleus in circular paths like planetary model. Nucleus (Protons & Neutrons) Electrons Circular orbit

Slide 7 : www.saitechinfo.com Bohr’s model 1. Atomic Hypothesis The protons and neutrons are present in the nucleus and all the electrons revolve around the nucleus in definite orbits.

Slide 8 : www.saitechinfo.com Sommerfeld model 1. Atomic Hypothesis According to this, the electron moving around the nucleus must describe an elliptical orbit in addition to circular orbits as suggested by Bohr.

Slide 9 : www.saitechinfo.com Quantum mechanical model 1. Atomic Hypothesis According to this, electrons are considered as three dimensional wave in electric field of the positively charged nucleus.

Slide 10 : www.saitechinfo.com Concept of atomic model 1. Atomic Hypothesis Orbit: A definite circular path Orbital: The total volume where the electron spends most of its time

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