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The Alchemists created four basic elements, fire, wind, earth, and water. They believed that everything was based off those four elements, later evolving into the periodic table.
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He found that there are only five solid shapes whose sides are made from regular polygons. Those shapes are triangles, squares, pentagons, hexagons etc. He was convinced that atoms of matter must derive from these five fundamental solids. -
He theorized that all material bodies are made up of invisible small atoms. -
This model is used to arrange solar system planets in order from the sun. The Solar System Model was made by Nicolaus Copernicus. -
Boyle proposed that elements are composed of ‘corpuscles’ or various types and sizes that are able to organize themselves into groups that represent different chemical substances. He was sometimes called the Father of Chemistry due to his work on materials. -
He was a French chemist who found that the total mass of products and reactants in chemical reactions is always the same.
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Dalton proposed that all matter was composed of atoms, or invisible and indestructible building blocks, better known as the atomic theory. -
The Billiard Ball Model shows how atoms relate to billiard or pool balls because of how Dalton saw them as solid and hard spheres. This model was made by John Dalton. -
He is best know for his hypothesis that equal volumes of different gases contain an equal number of molecules, provided that they are at the same temperature and pressure. -
He devised the periodic classification of the chemical elements, later classified as the periodic table. -
His experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. -
This model depicts the electrons as negatively charged particles embedded in sea of positive charge. This model was made by J.J. Thomson. -
The Curies discovered the strongly radioactive elements polonium and radium, occurring naturally in uranium minerals. -
He mathematically proved the existence of atoms. Proving to be a great contribution to the atomic theory. -
His major success was the accurate determination of the charge carried by an electron. He also proved that this quantity was a constant for all electrons, demonstrating the atomic structure of electricity. -
He is know for his pioneering studies of radioactivity and the atom. He discovered that there are two types of radiation, alpha and beta particles, from uranium. He also discovered that the atom consists of mostly empty space. -
He proposed and published a theory for the hydrogen atom based on the quantum theory that some physical quantities only take discrete values. This theory stated that electrons move around the nucleus but only prescribed orbits, and if electrons jump to a lower energy orbit, the difference is sent out as radiation. -
He published a paper concluding that the atomic number is the number of positive charges in the atomic nucleus. -
He showed that the quantization of the hydrogen atom’s energy levels that appeared could be described by the Schrodinger equations describing how the wave function of a quantum mechanical system evolves. -
The Electron Cloud Model shows a particular area in which an electron is likely to be. This model was made by Erwin Schrodinger. -
He formulated quantum mechanics in terms of matrices. He also discovered the uncertainty principle that states that a particles position and momentum cannot both be known exactly. -
He is a physicist most known for his discovery of the neutron, a particle that helps make up an atom’s nucleus.