Atoms, Moles, Formulae and Equations

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Atom is the smallest particle of an element, which can take part in chemical reaction.
Molecule is the smallest particle of an element which can exist on its own and still retain the chemical properties of that element. 
Ion is an atom or group of atoms which are either positively or negatively charged due to loss or gain of electrons.
First 20 elements HydrogenHeliumLithiumBerylliumBoronCarbonNitrogenOxygenFlourineNeonSodiumMagnesiumAluminumSiliconPhosphorusSulphurChlorineArgonPotassiumCalciumRelative atomic mass of an element is the number of times the average mass of one atom of an element is greater than one twelfth of the mass of carbon 12. Relative Molecular mass of a compound is the number of times the average mass of one Molecule of the substance is greater than one-twelfth of the mass of carbon 12.
Mole One mole of a substance is the amount containing as many elementary entities as the number of atoms in exactly 12 grams of carbon 12.  Note: Avogadro number = 6.02 ×10²³ Molar mass o…
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