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Periodic Classification of Elements notes by pramod bhoj sir

    2    Periodic Classification of Elements                                                 (Pramod Bhoj sir notes)     The smallest particles are called atoms. Types of matter are solid , liquid , gas. Types of elements are metals , non-metals , metalloids. Today 118 elements were known. Q1. Why classification of elements ? More number of elements were discovered in the course of time. More and more information about the properties of these elements was gathered. To ease the study of such a large number of elements, scientists started studying the pattern if any, in the vast information about them. Dobereiner’s Triads ·         In the year 1817 a German scientist ...

Notes for - Chemical Reaction and Equations by pramod bhoj sir

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3   Chemical Reaction and Equations                                                                  (Pramod bhoj sir notes ) Basic Types of molecules of elements and compounds Type of Elements   Metals ,   Non-metals   ,   Metalloids The compounds are altogether different from those of the constitutional elements . Valency   – The number of electrons that an atom of an elements gives away or thake up for forming new ionic bonds. Valency is an important for type of   chemical reactions . Chemical Reactions – Scientists carried out experiments and prove that – ·         During chemical reaction composition of matter change and remain permanent. ·   ...

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