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๐โป๏ธAtoms & Moleculesโป๏ธ๐
Around 500 BC, an Indian Philosopher Maharishi Kanad, first time postulated the concept of indivisible part of matter and named it โpramanu.โ
In 1808, John Dalton used the term โatomโ and postulated the atomic theory to the study of matter.
๐
Daltonโs Atomic Theory
โAccording to Daltonโs atomic theory, all matter, whether an element, a compound or a mixture is composed of small particles called atoms.
โAccording to Daltonโs atomic theory, all matters, whether they are elements, compounds, or mixtures, are composed of small particles known as atoms.
๐
Salient features of Daltonโs Atomic Theory
โAll matter is made of very miniscule particles known as atoms.
โAtom is an indivisible particle, which cannot be created or destroyed through chemical reaction.
โAll atoms of an element are identical in mass and chemical properties whereas, atoms of different elements have different masses and chemical properties.
โTo form a compound, atoms are combined in the ratio of small whole numbers.
โIn a given compound, the relative number and kinds of atoms are constant.
๐
Atomic Mass
โThe mass of an atom of a chemical element; it is expressed in atomic mass units (symbol is u).
โThe atomic mass is roughly equivalent to the number of protons and neutrons present in the atom.
โOne 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.
๐
Molecule
โThe smallest particle of an element or a compound, which is capable to exist independently and shows all the properties of the respective substance.
โA molecule, normally, is a group of two or more atoms which are chemically bonded together.
โAtoms of the same element or of different elements can join (with chemical bond) together to form molecules.
โThe number of atoms that constitute a molecule is known as its atomicity.
๐
Ion
โA charged particle is known as ion; it could be either negative charge or positive charge.
โThe positively charged ion is known as a โcationโ.
โThe negatively charged ion is known as an โanion.โ
๐
Chemical Formulae
โA chemical formula of a compound demonstrations its constituent elements and the number of atoms of each combining element.
โThe chemical formula of a compound is the symbolic representation of its Composition.
โThe combining capacity of an element is known as its โvalency.โ
๐
Molecular Mass
โThe 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 โ
โAtomic mass of hydrogen = 1u
โAtomic mass of oxygen = 16 u
โThe water contains two atoms of hydrogen and one atom of oxygen.
โMolecular Mass of Water is = 2 ร 1+ 1ร16 = 18 u (u is the symbol of molecular mass).
๐
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.
๐
Avogadro Constant or Avogadro Number
โAvogadro was an Italian scientist who had given the concept of Avogadro Number (also known as Avogadro Constant).
โThe number of particles (atoms, molecules, or ions) present in 1 mole of any substance is fixed, and its value always calculated as 6.022 ร 1023.
โIn 1896, Wilhelm Ostwald had introduced the concept of โmole;โ however, mole unit was accepted to provide a simple way of reporting a large number in 1967.
๐
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 โLaw of Conservation of Mass.โ
๐
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 โLaw of Definite Proportions.โ
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