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Antoine Lavoisier
He discovered his law of conservation in 1785. He began the conservation on what an atom was exactly. His law states that matter cannot be made or destroyed. -
Joseph Louis Proust
He first discovered his Law of Definite Proportions in 1794. His law states that a compound is composed of exact proportions of elements by mass regardless of how the compound was created. -
The Solid Sphere Model
He hypothesized that an atom is a solid sphere that could not be divided into smaller particles. He came up with his theory as a result of his research into gases. He realized that certain gases only combined in specific proportions. -
John Dalton
He believes that all matter is made of atoms. Atoms are indivisible and indestructible which he proposed in 1805. -
Michael Faraday
He made one of the most significant discoveries that led to the idea that atoms had an electrical component. Faraday placed two opposite electrodes in a solution of water containing a dissolved compound. -
Henri Becquerel
While studying the effect of x-rays on photographic film, he discovered some chemicals spontaneously decompose and give off very pentrating rays. -
Plum Pudding Model
Thomson discovered the electron, a negatively charged particle more than two thousand times lighter than a hydrogen atom. Thomson originally believed that the hydrogen atom must be made up of more than two thousand electrons, to account for its mass. -
Max Planck
He used the idea of quanta which is the discrete units of energy to explain hot glowing matter. He proposed this is 1900. -
Marie Curie
Her contributions to the study of radium and radiation was an instrumental technology for the future development of the atomic bomb. She proposed this in 1903. -
J.J Thomson
The Plum Pudding Model is a scientific method that he proposed in 1904. His last important program focused on determining the nature of positively charged particles. -
Albert Einstein
Einstein proposed that light energy can be absorbed or emitted only in discrete packets called quanta, a provocative contradiction of the then-prevalent wave theory of light -
Robert Millikan
Between 1908 and 1917, he measured the charge on an electron with the appartus. -
Ernest Rutherford
In 1911, the atom consisted of subatomic particles called protons and electrons. The nucleus was postulated as small and dense to account for the scattering of alpha particles from thin gold foil. -
Planetary Model
Rutherford atomic model, also called planetary model of the atom, Rutherford atomic model was proposed by Ernest Rutherford. The model described the atom as a tiny, dense, positively charged the nucleus. -
Erwin Schrodinger
He proposed in 1913 that electrons are arranged in concentric circular orbits around the nucleus. His model is patterned on the solar system and is known as the planetary model. -
Quantum Mechanical Model
Niels Bohr used what had recently been discovered about energy to propose his planetary model of the atom. In the Bohr model, the neutrons and protons are contained in a small, dense nucleus, which the electrons orbit in defined spherical orbits. -
Niels Bohr
After studying Rutherford's work, Bohr explained what happens inside an atom and developed a picture of atomic structure. This work earned him a Nobel Prize of his own in 1922. -
Electron Cloud Model
Erwin Schrödinger it consisted of a dense nucleus surrounded by a cloud of electrons at various levels in orbitals. He mathematically determined regions in which electrons would be most likely found. -
Louis de Broglie
He developed his ideas by the wave mechanics theory. This theory has greatly improved our knowledge of the physical nature on the atomic scale. He received the Nobel Prize for Physics on his wave nature of electrons discovery in 1929. -
James Chadwick
Chadwick made a fundamental discovery in the doorman of nuclear science.He proved the existence of neutrons. He established that atomic number is determined by the numbers of protons in an atom. -
Otto Hahn
He discovered nuclear fission with fellow scientist Fritz Strassmann. Which is a process that generates nuclear energy. -
Lise Meitner
She conducted experiments verifying that heavy elements capture neutrons and form unstable products which undergo fission. This process ejects more neutrons continuing the fission chain reaction. -
Glen T. Seaborg
In 1941, he isolated Uranium-233 and established thorium's nuclear fuel potential. Between 1944 and 1958, Seaborg identified eight elements – americium, curium , berkelium, californium , einsteinium , fermium , mendelevium , and nobelium . Element seaborgium, is named after him.
