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🌀♻️Atoms & Molecules♻️🌀 Around 500 BC, an Indian Philosopher Maharishi Kanad, first time postulated the concept of indivisible part of matter and named it ‘pramanu.’ In 1808, John Dalton used the term ‘atom’ and postulated the atomic theory to the study of matter. 🔅Dalton’s Atomic Theory ➖According to Dalton’s atomic theory, all matter, whether an element, a compound or a mixture is composed of small particles called atoms. ➖According to Dalton’s atomic theory, all matters, whether they are elements, compounds, or mixtures, are composed of small particles known as atoms. 🔅Salient features of Dalton’s Atomic Theory ➖All matter is made of very miniscule particles known as atoms. ➖Atom is an indivisible particle, which cannot be created or destroyed through chemical reaction. ➖All atoms of an element are identical in mass and chemical properties whereas, atoms of different elements have different masses and chemical properties. ➖To form a compound, atoms are combined in the ratio of small whole numbers. ➖In a given compound, the relative number and kinds of atoms are constant. 🔅Atomic Mass ➖The mass of an atom of a chemical element; it is expressed in atomic mass units (symbol is u). ➖The atomic mass is roughly equivalent to the number of protons and neutrons present in the atom. ➖One atomic mass unit is a mass unit equal to the exactly one-twelfth (1/12th) the mass of one atom of carbon-12 and the relative atomic masses of all elements have been calculated with respect to an atom of carbon-12. 🔅Molecule ➖The smallest particle of an element or a compound, which is capable to exist independently and shows all the properties of the respective substance. ➖A molecule, normally, is a group of two or more atoms which are chemically bonded together. ➖Atoms of the same element or of different elements can join (with chemical bond) together to form molecules. ➖The number of atoms that constitute a molecule is known as its atomicity. 🔅Ion ➖A charged particle is known as ion; it could be either negative charge or positive charge. ➖The positively charged ion is known as a ‘cation’. ➖The negatively charged ion is known as an ‘anion.’ 🔅Chemical Formulae ➖A chemical formula of a compound demonstrations its constituent elements and the number of atoms of each combining element. ➖The chemical formula of a compound is the symbolic representation of its Composition. ➖The combining capacity of an element is known as its ‘valency.’ 🔅Molecular Mass ➖The molecular mass of a substance is calculated by taking the sum of the atomic masses of all the atoms in a molecule of respective substance. For example, the molecular mass of water is calculated as − ➖Atomic mass of hydrogen = 1u ➖Atomic mass of oxygen = 16 u ➖The water contains two atoms of hydrogen and one atom of oxygen. ➖Molecular Mass of Water is = 2 × 1+ 1×16 = 18 u (u is the symbol of molecular mass). 🔅Formula Unit Mass The formula unit mass of a substance is calculated by taking the sum of the atomic masses of all atoms in a formula unit of a compound. 🔅Avogadro Constant or Avogadro Number ➖Avogadro was an Italian scientist who had given the concept of Avogadro Number (also known as Avogadro Constant). ➖The number of particles (atoms, molecules, or ions) present in 1 mole of any substance is fixed, and its value always calculated as 6.022 × 1023. ➖In 1896, Wilhelm Ostwald had introduced the concept of ‘mole;’ however, mole unit was accepted to provide a simple way of reporting a large number in 1967. 🔅Law of Conservation of Mass During a chemical reaction, sum of the masses of the reactants and products remains unchanged, which is known as the ‘Law of Conservation of Mass.’ 🔅Law of Definite Proportions In a pure chemical compound, its elements are always present in a definite proportion by mass, which is known as the ‘Law of Definite Proportions.’ ☘☘MUST SHARE WITH FRIENDS ☘☘

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