-
460 BCE
Democritus
Democritus is a ancient Greek pre-Socratic philosopher primarily known for the formulation of an atomic theory of the universe. -
428 BCE
plato
plato was also ancient Greek philosopher , Plato wrote dialogue, he tried writing his dialogue to a create fictional world for the purpose of telling a story -
384 BCE
aristole
Aristotle was a Greek philosopher and discovered the theory that there are elements, which implied in his theory. And the contribution that caused to the emergence of the atomic theory -
Robert boyle
Robert discovered that the volume of a gas decreases with increasing pressure and vice versa. -
lavoisier
Lavoisier discovered the role of oxygen plays in combustion, he helped construct the metric system, wrote the first extensive list of elements. -
john dalton
john dalton developed atomic theory upon modern physical science. -
john dalton
major findings: Daltons experiment on gases led to discovery that the total pressures of a mixture of gas amounted
name: john Dalton -
solid sphere model
the solid sphere model was the first atomic model and was developed by john dalton, he hypothesized that an atom is a solid sphere that could not be divided into smaller pieces -
Dmitri Mendeleev
he formulated the periodic law and created a farsighted version of the periodic table of elements, such as valence and atomic weight of uranium. -
J.J Thomson
J.J Thomason created the electron in 1897 by the English physicist, he called the electrons corpuscles. They played a role in revolutionizing knowledge of atoms. -
the curies
The two husband nd wife discovered two new elements, radium and polonium. Two radioactive elements. She found out that the properties of x-rays were able to kill tumors. -
Robert Millikan
in 1909 Millikan began a series of experiments to determine electric charge carried by a single electron. -
ernest rutherford
rutherford discovered the concept of radioactive half-life, the radioactive element radon, it differentiated and was named alpha and beta radiation. -
albert Einstein
Albert enabled the determination of Avogadro's number and therefore the size of molecules -
neils bohr
he made fundamental contributions in understanding the structure of the atoms, and developing the early theory of quantum physics. -
henry g. J. Mosley
Henry Moseley was an outstanding skilled experimental physicist. He used self built equipment to prove that every elements identity is uniquely determined by the number of protons it has. -
werner heisenberg
heisenberg was a german theoretical physicist and one of the key pioneers of quantum mechanics. -
plum pudding model
plum model is a scientific model of the atom. Created by J.J thomson. The model was to explain the two property of the atom -
electron cloud
the electron cloud model was developed by erwin schrodinger.The model is a way to help visualize the most probable position of electrons in an atom -
solar system model
Solar System model illustrates the relative positions and motions of the planets and moons in the Solar System. Was created by nelis bohr -
the alchemist
Based on theories and experiments on the Aristotelian assumption that the world and everything in it are composed of four basic elements, air, earth, fire, and water .
