A presentation byGulshan Chaudhary

X F

Atoms & Molecule

An Indian philosopher Maharishi Kanad,

postulated that if we go ondividing matter

(padarth)

LAW OF CONSERVATION OF

MASSDuring a chemical reaction, the sum of the masses of the reactants and products remains

unchanged. This is known as the Law of

Conservation of Mass

8 X2Y16 X 8 Y+

2

LAW OF CONSTANT

PROPORTIONSIn a pure chemical compound, elements are always present ina definite proportion by mass.

ElementA PURE SUBSTANCE THAT CONSISTS ONLY OF ATOMS WITH THE SAME NUMBER OF PROTONS

Thomson’s Model of the Atom"plum pudding" model (1897)Positive charge spread over the entire sphere

positivecharge

electron

PERIODIC TABLE

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THE END