#Dalton Atomic Model

⚛️ Atomic Models (Complete Guide) Atomic models explain how scientists understood the structure of the atom over time. 1. Dalton’s Atomic Model (1803) Main Idea: Atom is a solid, indivisible sphere. Key Points: Atoms are tiny, indivisible particles Atoms of the same element are identical Atoms combine in simple ratios to form compounds Limitation: Could not explain electricity or subatomic particles 2. Thomson’s Atomic Model (1897) Main Idea: Atom is a positively charged sphere with electrons embedded in it. Key Points: Discovery of electron Atom is divisible Called “Plum Pudding Model” Limitation: Could not explain scattering of alpha particles 3. Rutherford’s Atomic Model (1911) Main Idea: Atom has a dense nucleus with electrons revolving around it. Key Points: Most of atom is empty space Nucleus is small, dense, positively charged Electrons revolve around nucleus Limitation: According to classical physics, electrons should lose energy and fall into nucleus 4. Bohr’s Atomic Model (1913) Main Idea: Electrons move in fixed circular orbits with quantized energy. Key Points: Electrons orbit in specific energy levels (shells) No energy loss in stable orbits Energy is absorbed/emitted when electron jumps Limitation: Works only for hydrogen-like atoms Cannot explain fine spectral lines 5. Quantum Mechanical Model (Modern Model) Main Idea: Electrons behave like waves and exist in probability clouds. Key Points: Based on Erwin Schrödinger equation Electrons are found in orbitals (probability regions) Exact position cannot be known (uncertainty principle) Features: s, p, d, f orbitals Most accurate model #Physicsvibespk #AtomicModel #ScienceNotes #PhysicsStudent #modernphysics

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. . Imagine drawing shrödinger's model on paper 😭 . . John Dalton proposed that matter is composed of indivisible particles called atoms, laying the foundation for modern atomic theory in the early 1800s. J.J. Thomson discovered electrons in 1897, leading to the "plum pudding" model, which described atoms as spheres of positive charge with embedded electrons (just like a plum pudding!). Subsequent experiments would prove this model wrong. Ernest Rutherford, through his gold foil experiment in 1911, introduced the concept of a dense, positively charged nucleus at the center of the atom, around which electrons orbit. However his model couldn't explain the stability of the electron orbits (since electrons are attracted to protons, why doesn't the electrons collapse into the nucleus?) In 1913, Niels Bohr developed a model where electrons travel in specific energy levels or shells around the nucleus, explaining atomic emission spectra. Bohr's model addressed the stability and spectral lines but only for simple atoms like Hydrogen. Erwin Schrödinger, in 1926, introduced wave mechanics, describing electrons as wave functions, leading to probability distributions and orbitals. This approach resolved many of the previous model issues by providing the most accurate and comprehensive description of atom models even today.

ATOMIC MODEL THROUGH HISTORY 1. John Dalton’s Model (1803) – Solid Sphere Model Overview: Dalton proposed that all matter is made up of indivisible particles called atoms. He imagined atoms as tiny, solid spheres—like billiard balls. Key Ideas: Atoms of the same element are identical in mass and properties. Atoms cannot be created, divided, or destroyed. Compounds form when atoms of different elements combine in fixed ratios. Importance: First scientific model of the atom based on experimental evidence (like gas laws). Laid the groundwork for modern chemistry. --- 2. J.J. Thomson’s Model (1904) – Plum Pudding Model Overview: After discovering the electron, Thomson proposed that atoms are made of a positively charged substance with negatively charged electrons scattered within it—like raisins in pudding. Key Ideas: Atoms are divisible. Electrons are negatively charged subatomic particles. The rest of the atom is a blob of positive charge to balance the electrons. Importance: First model to show that atoms have internal structure. Introduced the idea of subatomic particles. --- 3. Ernest Rutherford’s Model (1911) – Nuclear Model Overview: Conducted the gold foil experiment where alpha particles were fired at a thin sheet of gold. Most passed through, but some were deflected at large angles. Key Ideas: Atoms are mostly empty space. A small, dense, positively charged nucleus is at the center. Electrons orbit around this nucleus. Importance: Disproved the plum pudding model. Introduced the concept of a nucleus. --- 4. Niels Bohr’s Model (1913) – Planetary Model Overview: Bohr expanded on Rutherford’s model using discoveries from quantum theory. Key Ideas: Electrons orbit the nucleus in fixed paths or “energy levels.” Each level has a specific amount of energy. Electrons can jump to higher levels when energy is absorbed and fall back down when energy is released (as light). Importance: Explained why atoms emit light in specific colors (atomic spectra). Added the concept of quantized energy levels. --- 5. Erwin Schrödinger’s Model (1926) – Quantum Mechanical Model (Electron Cloud Model) Overview: Schrödinger used complex

History of the Atom ⚛️ Key points 🎯 - John Dalton suggested the atom was a solid sphere - JJ Thomson came up with the plum pudding model which consists of a ball of positive charge with negative electrons embedded throughout - Ernest Rutherford carried out the alpha particle scattering experiment . He made 3 conclusions ; atom is mostly empty space , nucleus is the most dense part of the atom , nucleus is positively charged - Niels Bohr suggested that electrons orbit the nucleus at fixed distances which explains the electron shells - James Chadwick discovered the neutron Each scientist contributed to the model of the atom we use today so ensure you know their name and discovery. Comment ATOM if you want the revision sheet to go with this topic gcse chemistry revision online aqa tips

📈 Evolution of Atomic Theory: Atomic Models through Time 🕰️ Biscuit Art Credits: @kd_fen_paylasim ❤️ Modern Scientific Era (1803–Present): 👇🏼👇🏼 ▪️1803: Dalton’s Billiard Ball Model (John Dalton): Dalton proposed that atoms are solid, indivisible spheres, identical for a given element, which combine in fixed ratios to form compounds. ▫️1904: Thomson’s Plum Pudding Model (J.J. Thomson): Following his discovery of the electron, Thomson suggested that atoms consist of a sphere of positive charge with electrons embedded within it. ▪️1911: Rutherford’s Nuclear Model (Ernest Rutherford): Rutherford’s gold foil experiment revealed that atoms have a small, dense, positively charged nucleus at the center, with electrons orbiting around it, and are mostly empty space. ▫️1913: Bohr’s Planetary Model (Niels Bohr): Bohr built upon Rutherford’s model, proposing that electrons orbit the nucleus in specific, quantized energy levels. ▪️1926: Schrödinger’s Quantum Mechanical Model (Erwin Schrödinger): This model describes electrons in terms of probability clouds or orbitals rather than fixed paths, using complex mathematics to predict their location. ▪️1932: Chadwick’s Discovery of the Neutron (James Chadwick): Chadwick discovered the neutron, a neutral particle located in the nucleus with a mass similar to a proton, completing the understanding of the atomic nucleus.

--> ♊ - Here is the arrangement and Evolution of Quantum theory with respect to time . 1. Dalton's theory of atoms (1803)  -> John Dalton was an English chemist, physicist and meteorologist. He introduced the atomic theory into chemistry. He also researched colour blindness; as a result, the umbrella term for red-green congenital colour blindness disorders is Daltonism in several languages. History of atomic theory Wikipedia ⬇️ Link = https://lnkd.in/e2axS7Wq 2. Thomson's Atomic Model (1904) --> The plum pudding model is an obsolete scientific model of the atom. It was first proposed by J. J. Thomson in 1904 following his discovery of the electron in 1897 and subsequently rendered obsolete by Ernest Rutherford's discovery of the atomic nucleus in 1911. The model tried to account for two properties of atoms then known: that there are electrons and that atoms have no net electric charge. Logically there had to be a commensurate quantity of positive charge to balance out the negative charge of the electrons, but having no clue as to the source of this positive charge, Thomson tentatively proposed it was everywhere in the atom, the atom being in the shape of a sphere. Plump pudding model Wikipedia ⬇️ Link = https://lnkd.in/e25UpzXy 3. Rutherford's Gold Foil Experiment (1909) ---> The Rutherford model was devised by Ernest Rutherford to describe an atom. Rutherford directed the Geiger–Marsden experiment in 1909, which suggested, upon Rutherford's 1911 analysis, that J. J. Thomson's plum pudding model of the atom was incorrect. Rutherford's new model for the atom, based on the experimental results, contained new features of a relatively high central charge concentrated into a very small volume in comparison to the rest of the atom and with this central volume containing most of the atom's mass; this region would be known as the atomic nucleus. Rutherford's Model Wikipedia ⬇️ Link = https://lnkd.in/epeWwNJB 4. Bohr's Model (1913) ----> In atomic physics, the Bohr model or Rutherford–Bohr model is an obsolete model of the atom, presented by Niels Bohr and Ernest Rutherford in 1913. It consists of a small, dense nucleus surrounded by orbiting electrons. It is

Os modelos atômicos desenvolvidos foram: modelo atômico de Dalton, modelo atômico de Thomson, modelo atômico de Rutherford, modelo atômico de Bohr e modelo atômico de Schrödinger. Música: Carnival Músico: SoundCarousel URL: https://pixabay.com/music/dance-carnival-10957/

O maior erro que você pode cometer é achar que o modelo de Dalton é "velho" demais para cair na prova. Ele ele foi muito importante para explicar as Leis Ponderais e a conservação das massas! Não caia nessa armadilha: cada modelo atômico resolveu um problema que o anterior não conseguia explicar. No post de hoje, organizei a trajetória definitiva para você dominar esse conteúdo de uma vez por todas. No final desse post você vai entender tudo sobre a evolução da nossa visão do átomo, de Dalton até Schrödinger. 💾👇Salva esse post pra revisar antes da prova ________________________________________ 🎓 Quer dominar Química para passar nas provas? Se você precisa de um acompanhamento mais próximo, eu ofereço aulas de reforço estruturadas para transformar sua base e garantir sua aprovação. 🚀 Não perca tempo: as vagas para as aulas particulares são limitadas.

Do Modern ‘Images’ of Atoms Show Reality—or Models? This clip was taken from our webinar "Looking at DNA Testing, Measles, Science News + Q&A - 3/4/26" - to find the full video please click the link in our bio and go to "Tom's Livestream Recordings." #drtomcowan #tomcowan #Atoms

"Unlocking the basics with Dalton's Atomic Model! 🔬 John Dalton introduced the idea that atoms are the smallest indivisible units of matter. This pioneering theory is crucial for mastering atomic structure in JEE & NEET. Let's ace chemistry together! #neet #neetug #neetexam #neetnotes #neetaspirants #jee #jeemiains #jeeaspirants #chemistry #class11 #ncert