1. Acid
2. Bases and Alkalis
3. PH
4. Salts
➢ Dalton’s Atomic Theory
John Dalton provided a simple theory of matter to provide theoretical justification to the laws of chemical combinations in 1805.
The basic postulates of the theory are:
➢ Representation of an Atom by a Symbol
➢ Size of the Atom/ Elements
➢ Atomic Mass
One atomic mass unit is a mass unit equal to exactly one twelfth (1/12th) the mass of one atom of carbon-12.
➢ Molecule
➢ Chemical Formulae
➢ Molecular Mass
➢ Mole Concept
➢ Rutherford’s Model of the Atom
➢ Neils Bohr's Model
➢ J. Chadwick Discovery
➢ Valency
➢ Atomic Number
➢ Mass Number
Mass number = Number of protons + Number of neutrons
➢ Radioactivity
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