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ALLEN VIDEO LECTURES๐Ÿ‘‡ FOR NEET - @ALLENVIDEOLECTURESNEET FOR JEE - @ALLENVIDEOLECTURESJEE
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๐ŸŒ€โ™ป๏ธAtoms & Moleculesโ™ป๏ธ๐ŸŒ€ Around 500 BC, an Indian Philosopher Maharishi Kanad, first time postulated the concept of indivisible part of matter and named it โ€˜pramanu.โ€™ In 1808, John Dalton used the term โ€˜atomโ€™ and postulated the atomic theory to the study of matter. ๐Ÿ”…Daltonโ€™s Atomic Theory โž–According to Daltonโ€™s atomic theory, all matter, whether an element, a compound or a mixture is composed of small particles called atoms. โž–According to Daltonโ€™s atomic theory, all matters, whether they are elements, compounds, or mixtures, are composed of small particles known as atoms. ๐Ÿ”…Salient features of Daltonโ€™s Atomic Theory โž–All matter is made of very miniscule particles known as atoms. โž–Atom is an indivisible particle, which cannot be created or destroyed through chemical reaction. โž–All atoms of an element are identical in mass and chemical properties whereas, atoms of different elements have different masses and chemical properties. โž–To form a compound, atoms are combined in the ratio of small whole numbers. โž–In a given compound, the relative number and kinds of atoms are constant. ๐Ÿ”…Atomic Mass โž–The mass of an atom of a chemical element; it is expressed in atomic mass units (symbol is u). โž–The atomic mass is roughly equivalent to the number of protons and neutrons present in the atom. โž–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. ๐Ÿ”…Molecule โž–The smallest particle of an element or a compound, which is capable to exist independently and shows all the properties of the respective substance. โž–A molecule, normally, is a group of two or more atoms which are chemically bonded together. โž–Atoms of the same element or of different elements can join (with chemical bond) together to form molecules. โž–The number of atoms that constitute a molecule is known as its atomicity. ๐Ÿ”…Ion โž–A charged particle is known as ion; it could be either negative charge or positive charge. โž–The positively charged ion is known as a โ€˜cationโ€™. โž–The negatively charged ion is known as an โ€˜anion.โ€™ ๐Ÿ”…Chemical Formulae โž–A chemical formula of a compound demonstrations its constituent elements and the number of atoms of each combining element. โž–The chemical formula of a compound is the symbolic representation of its Composition. โž–The combining capacity of an element is known as its โ€˜valency.โ€™ ๐Ÿ”…Molecular Mass โž–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 โˆ’ โž–Atomic mass of hydrogen = 1u โž–Atomic mass of oxygen = 16 u โž–The water contains two atoms of hydrogen and one atom of oxygen. โž–Molecular Mass of Water is = 2 ร— 1+ 1ร—16 = 18 u (u is the symbol of molecular mass). ๐Ÿ”…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. ๐Ÿ”…Avogadro Constant or Avogadro Number โž–Avogadro was an Italian scientist who had given the concept of Avogadro Number (also known as Avogadro Constant). โž–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 ร— 1023. โž–In 1896, Wilhelm Ostwald had introduced the concept of โ€˜mole;โ€™ however, mole unit was accepted to provide a simple way of reporting a large number in 1967. ๐Ÿ”…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 โ€˜Law of Conservation of Mass.โ€™ ๐Ÿ”…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 โ€˜Law of Definite Proportions.โ€™ โ˜˜โ˜˜MUST SHARE WITH FRIENDS โ˜˜โ˜˜ Visit for more๐Ÿ‘‡ Jeeneetforall.in
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JEE ADVANCED 2021 Papers 1 and 2 Official question paper(s) [Merged in the following manner : Mathematics paper 1 Mathematics paper 2 Physics paper 1 Physics paper 2 Chemistry paper 1 Chemistry paper 2]
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Doubtnut ke Study Channels par ab sirf Instant doubt solving hi nahi ๐Ÿ˜๐Ÿ˜ Milenge PDFs ๐Ÿ“, Latest News ๐Ÿ“ฐ, Previous Year Papers ๐Ÿ“„, Free Live Classes & aur bhi bhot kuch ๐ŸŽŠ Abhi join karein Doubtnut ,๐ŸŽ‰ Official Telegram Channel ko!! ๐Ÿท Doubnut Official Channel ๐Ÿฅณ โžค https://t.me/Doubtnut ๐Ÿท Doubtnut NEET ๐Ÿ† โžค https://t.me/Doubtnut_NEET ๐Ÿท Doubtnut IIT JEE ๐Ÿ† โžค https://t.me/DoubtnutIITJEE
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EVERYTHING IS FREE (FOR JEE/NEET ASPIRANTS) PHYSICS COMPLETE โคNOTES KOTA ALLEN KOTA BANSAL VIDYA MANDIR CLASSES โคVIDEO LECTURES VIDEO LECTURES-1 (UNACADEMY) VIDEO LECTURES-2(ETOOS) โคASSIGNMENTS (QUESTIONS) LINK1[ALLEN] LINK-2 [MOTION] LINK-3[VMC] ALL THE BEST FOR JEE/NEET โคJOIN @JEENEETFORALLBLOG ๐Ÿ”ฅ๐Ÿ”ฅMATHEMATICS AVAILABLE FOR FREE DOWNLOAD โคNOTES LINK 1{HANDWRITTEN} LINK2{MOTION} LINK3{ALLEN KOTA} LINK4{VIDYAMANDIRCLASSES} โคASSIGNMENTS LINK1{MOTION} LINK2{VIDYAMANDIRCLASSES} LINK3{ETOOS,MC SIR} โคVIDEO LECTURES[PREMIUM] GB SIR {ETOOS} MC SIR{ETOOS} CHEMISTRY MATHS AND BIO ALSO UPLOADED ON SITE๐Ÿ‘‡ Jeeneetforall.in Jeeneetforall.in Jeeneetforall.in Jeeneetforall.in Jeeneetforall.in
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โŒโŒโŒโŒโŒโŒโŒโŒโŒโŒโŒโŒ ๐Ÿ”ด ๐˜ผ๐™‡๐™€๐™๐™ ๐Ÿ”ด๐Ÿ”ด ๐™’๐˜ผ๐™๐™‰๐™„๐™‰๐™‚ ๐Ÿ”ด โ‰๏ธโ€ผ๏ธโ€ผ๏ธโ€ผ๏ธโ‰๏ธโ‰๏ธโ‰๏ธโ€ผ๏ธโ€ผ๏ธโ€ผ๏ธโ‰๏ธโ€ผ๏ธ ๐–๐„ ๐€๐‘๐„ ๐†๐Ž๐ˆ๐๐† ๐“๐Ž ๐Œ๐„๐‘๐†๐„ ๐–๐ˆ๐“๐‡ ๐€ ๐๐‘๐€๐๐ƒ ๐๐„๐– ๐‚๐‡๐€๐๐๐„๐‹ ๐Œ๐€๐๐€๐†๐„๐ƒ ๐๐˜ ๐€๐ˆ๐ˆ๐Œ๐’ & ๐ˆ๐ˆ๐“ ๐’๐“๐”๐ƒ๐„๐๐“๐’ ๐…๐Ž๐‘ ๐’๐„๐‘๐ˆ๐Ž๐”๐’ ๐€๐’๐๐ˆ๐‘๐€๐“๐ˆ๐Ž๐ ๐Ž๐… ๐‰๐„๐„ / ๐๐„๐„๐“ ๐Ÿ˜ฑ ๐–๐„ ๐–๐ˆ๐‹๐‹ ๐”๐๐‹๐Ž๐€๐ƒ ๐…๐Ž๐‹๐‹๐Ž๐–๐ˆ๐๐† ๐“๐‡๐ˆ๐๐†๐’ ๐Ž๐ ๐“๐‡๐€๐“ ๐‚๐‡๐€๐๐๐„๐‹๐Ÿ‘‡ ๐Ÿ‘‡ ๐Ÿ) ๐‡๐€๐๐ƒ๐–๐‘๐ˆ๐“๐“๐„๐ ๐๐Ž๐“๐„๐’ ๐Ÿ) ๐“๐Ž๐๐ˆ๐‚ ๐–๐ˆ๐’๐„ ๐“๐„๐’๐“ ๐๐€๐๐„๐‘๐’ ๐€๐๐ƒ ๐ƒ๐๐ ๐Ÿ‘) ๐“๐„๐’๐“ ๐’๐„๐‘๐ˆ๐„๐’ ๐ˆ๐ ๐…๐‘๐„๐„ ๐Ÿ’) ๐€๐‹๐‹ ๐๐Ž๐Ž๐Š๐’ ๐๐ƒ๐… ๐–๐‡๐ˆ๐‚๐‡ ๐€๐‘๐„ ๐๐Ž๐“ ๐€๐•๐€๐ˆ๐‹๐€๐๐‹๐„ ๐€๐๐˜๐–๐‡๐„๐‘๐„ ๐Ž๐ ๐ˆ๐๐“๐„๐‘๐๐„๐“ ( ๐ˆ๐ ๐…๐‘๐„๐„ ) ๐Ÿ“) ๐•๐ˆ๐ƒ๐„๐Ž ๐‹๐„๐‚๐“๐”๐‘๐„๐’ ๐Ÿ”) ๐‘๐„๐†๐”๐‹๐€๐‘ ๐๐”๐ˆ๐™๐™๐„๐’ ๐Ÿ•) ๐Œ๐ˆ๐๐ƒ๐Œ๐€๐ , ๐…๐‹๐€๐’๐‡๐‚๐€๐‘๐ƒ ๐“๐ˆ๐๐’ & ๐“๐‘๐ˆ๐‚๐Š๐’ ๐Ÿ–) ๐๐”๐„๐’๐“๐ˆ๐Ž๐๐’ ๐๐€๐๐Š๐’ ๐˜•๐˜ฐ๐˜ต๐˜ฆ :- AFTER 12 ๐˜ฉ๐˜ฐ๐˜ถ๐˜ณ ๐˜ต๐˜ฉ๐˜ช๐˜ด ๐˜ค๐˜ฉ๐˜ข๐˜ฏ๐˜ฏ๐˜ฆ๐˜ญ ๐˜ญ๐˜ช๐˜ฏ๐˜ฌ ๐˜ธ๐˜ช๐˜ญ๐˜ญ ๐˜ฃ๐˜ฆ ๐˜ฑ๐˜ข๐˜ช๐˜ฅ ๐Ÿ˜ค ๐Ÿ‘ป JOIN MY FRIEND'S Channel PLZ:) ๐Ÿ‘ป
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