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Democritus ( 500 B.C ) - Mitzuhiko Jane Santos

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Democritus ( 500 B.C ) - Mitzuhiko Jane Santos

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Democritus was a Greek philosopher who lived between 470-380 B.C. Democritus introduced the idea of the atom as the basic building block matter. He thought that atoms are tiny, uncuttable, solid particles that are surrounded by empty space and constantly moving at random. Democritus believed that everything in the universe was made up of atoms, which were microscopic and indestructible.

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John Dalton ( 1800's ) - Katherine Cabrera

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John Dalton ( 1800's ) - Katherine Cabrera

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John Dalton was an english chemist, meteorologist and physicist.
He is known for introducing the atomic theory in chemistry. He
Is also the first to study color blindness. His atomic model, solid sphere
model in 1803, states that all objects are made or composed of
Atoms, that they are a solid that cannot be divided or broken down
Into pieces. As a result of his gas study, he came up with this idea;
Gases could only be combined in specific proportions.

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The Solid Sphere model is an atomic model proposed by John Dalton in 1803 stating that all objects are made of particles called atoms, and that they are solid spheres that cannot be divided further into smaller particles.

What is the description of billiard ball model?

Because Dalton thought atoms were the smallest particles of matter, he envisioned them as solid, hard spheres, so he used wooden balls to model them.

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Joseph John Thomson was born in Cheetham Hill, a suburb of Manchester on December 18, 1856. He enrolled at Owens College, Manchester, in 1870, and in 1876 entered Trinity College, Cambridge as a minor scholar. He became a Fellow of Trinity College in 1880, when he was Second Wrangler and Second Smith’s Prizeman, and he remained a member of the College for the rest of his life, becoming Lecturer in 1883 and Master in 1918. He was Cavendish Professor of Experimental Physics at Cambridge, where he succeeded Lord Rayleigh, from 1884 to 1918 and Honorary Professor of Physics, Cambridge and Royal Institution, London

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The 'plum pudding' model of the atom was proposed by JJ Thomson, who had also discovered the electron. According to this model, the atom is a sphere of positive charge, and negatively charged electrons are embedded in it to balance the total positive charge. The electrons are like plums in a pudding

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Ernest Rutherford ( 1909 ) - Ashley Kaye Constantino

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Ernest Rutherford ( 1909 ) - Ashley Kaye Constantino

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The Rutherford model was devised by the New Zealand-born physicist 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 also containing the bulk of the atomic mass of the atom. This region would be known as the "nucleus" of the atom.

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Rutherford's atomic model became known as the nuclear model. In the nuclear atom, the protons and neutrons, which comprise nearly all of the mass of the atom, are located in the nucleus at the center of the atom. The electrons are distributed around the nucleus and occupy most of the volume of the atom.

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Niel Bohr ( 1913 ) - Mitzuhiko Jane Santos

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Niel Bohr ( 1913 ) - Mitzuhiko Jane Santos

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Niels Bohr was one of the foremost scientists of modern physics, best known for his substantial contributions to quantum theory. Niels Bohr proposed a model of the atom in which the electron was able to occupy only certain orbits around the nucleus. This atomic model was the first to use quantum theory, in that the electrons were limited to specific orbits around the nucleus.

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the Bohr model depicts an atom as a small, positively charged nucleus surrounded by electrons. These electrons travel in circular orbits around the nucleus. Similar in structure to the solar system, except electrostatic forces rather than gravity provide attraction.

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A nitrogen atom in the planetary model has a central nucleus made up of seven protons and seven neutrons, surrounded by seven electrons.

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James Chadwick ( 1932 ) - Kristanna Fey Lumanog

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James Chadwick ( 1932 ) - Kristanna Fey Lumanog

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Chadwick is best known for his discovery of the neutron in 1932. A neutron is a particle with no electric charge that, along with positively charged protons, makes up an atom's nucleus. Bombarding elements with neutrons can succeed in penetrating and splitting nuclei, generating an enormous amount of energy.

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According to the quantum mechanical model of the atom, a nucleus is surrounded by an electron cloud.
referred to as orbitals It explains that determining the precise location of the electron at any given time is impossible. Time, but its probable location can be determined. It incorporates the concept of Bohr's model, in which electrons move.
By absorbing or emitting energy, you can move from one orbital to another.

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James Chadwick demonstrated the existence of the neutron, which is also found in the nucleus, in 1923.
along with the proton, It has the same mass as a proton, but unlike the latter, it does not have an electric charge.

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Louis De Broglie and Erwin Schrodinger ( 1926-present  

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Louis De Broglie and Erwin Schrodinger ( 1926-present  

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Based on de Broglie's idea that particles could exhibit wavelike behavior, Austrian physicist Erwin Schrödinger theorized that the behavior of electrons within atoms could be explained by treating them mathematically as matter waves.

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The de Broglie atomic model was proposed by the French physicist Louis Broglie in 1924. In his doctoral thesis, Broglie asserted the wave-particle duality of electrons, laying the foundations for wave mechanics. Broglie published important theoretical findings on the wave-corpuscle nature of matter at the atomic scale.

Later, de Broglie statements were experimentally demonstrated by scientists Clinton Davisson and Lester Germer in 1927. De Broglie’s electron wave theory is based on Einstein’s proposal on the wave properties of light at short wavelengths.

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Erwin Schrodinger, an Austrian physicist came up with the electron cloud model in 1926. The electron cloud refers to a region outside the nucleus where an electron is most likely to be found.

Before understanding what an electron cloud model is, it is important to know about the forces that bind the electrons together. You might also like to know about the parts of an atom before exploring the concept of an electron cloud.