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…

Introduction to Chemistry

Chemistry is one of the branches of pure science which studies the composition, properties and uses of matter

Introduction to Chemistry
Before moving on let us firstly look at the definition of chemistry
 it is one of the branches of pure science that studies the composition, characteristics and applications of matter.
Branches of chemistry
Chemistry has many branches but they are basically categorised into three basic headings: These are
1. Organic chemistry: it is a branch of chemistry that deals with carbon and its components
2. Inorganic chemistry: it is a branch of chemistry which studies about inorgan matters like sulphur, etc
3. Physical chemistry: it is a branch of chemistry which studies state and path functions like enthalpy, etc.
Reasons why we study chemistry
1. It prepares us to study courses of our interest like engineering, medicine, etc
2. The research and study of chemistry contributed to the invention of a wide range of clothing materials.
3. Chemistry has helped to ensure the availability of medicines.

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