He created Dalton's Atomic Theory which said that all matter is composed of atoms, atoms cannot be made or destroyed,
all atoms of the same element are identical, different elements have different types of atoms, and a chemical reaction is a rearrangement of atoms. He also published Dalton's Law which stated total pressure exerted by a gaseous mixture is equal to the sum of the partial pressures of each individual component in a gas mixture.
He concluded tha in addition to the cathode rays that travel from the negatively charged cathode toward the positively charged anode, there is another ray that travels in the opposite direction, from the anode toward the cathode. Goldstein called these canal rays because they pass through the channels in the cathode.
Thomson proved that cathode rays were actually some speedily moving particles. After meausirng their speed and specific charge, he concluded that these "corpuscles" (electrons) were about 2000 times smaller in mass as compared to the hydrogen ion, the lightest-known atomic particle
He discovered aplha and beta radiation.
Planck combined the formulas of Wien and Rayleigh to form Planck;s radiation formula. He presented a theoretical explanation involving quanta of energy. He also discovered/created Planck's constant.
He co-discovered that radioactivity was a course of action in which atoms from one element disintegrated into atoms of a different element
He named gamma radiation and discovered it is more powerful than beta and alpha radiation.
Einstein created the theory of relaitivity, which laid the basis for the release of atomic theory. He also formulated the Special Theory of Relativity. He then established the law of mass through his famous formula E=mc2
He helped carry out the Geiger-Marsden experiment which allowed him to understanf the nuclear nature of atoms
Millikan’s earliest major success was the accurae determinaton of the charge carried by an electron using the “falling-drop method”. He also proved that this quantity was a constant for all electrons, which demonstrated the atomic structure of electricity.
The Rutherford model of the atom explained that a small positive charged nucleus was orbited by electrons
Millikan verified Einsteins’s very important photoelectric equation experimentally, and made the first direct photoelectric determination of Planck’s constant.
He discovered systematic relation between wavelength and atomic number which is called Moseley's Law. He also predicted a number of missing elements and their atomic numbers.
Bohr completed his theory of atomic structure in 1913. He stated that electrons have set energy levels and created a realistic model. His atomic theory was a combination of Rutherford’s work and ideas of the atom, with Planck’s Quantum Theory. Bohr received the Nobel Prize in Physics for his research in the atomic structure in1922.
He was the first person to transfer one element into another through a nuclear reaction.
He gave his theory about the existence of neutrons.
He formulated the quantum theory of ferromagnetism, the neutron-proton model of the nucleus, and the S-matrix theory in particle scattering. He also suggested the unified field theory a.k.a the "world formula". He is known for one of the earliest breakthroughs to quantum mechanics.
He is known for the tremendous discovery of the Schrodinger Wave Equation. The Schrodinger Equation is a wave equation in terms of the wavefunction that predicts logically and precisely the probability of events or outcome.
He thought about dual nature of light; the wave - particle duality. He suggested that matter might behaveina similar matter. He made the theory of electron waves, and resolved and offered an explanation to a question that was brought up by calculations of the motion of electrons within atoms.
Chadwick discovered the exsistence of the neutron and that it had 0.1 percent more mass than a proton. This was one of the most important scientific discoveries of the twentieth century. He received the Noble Prize for discovery in 1935.
discovered oxygen, carbon monoxide, and nitrogen dioxide
Father of modern chemistry
Law of conservation of mass
first electric discovery
discovered laws of electrochemistry
Dynamite, Nobel Prize
Nuclear chain reactions
Polymerase chain reaction