-
said that the stars, planets, and the sun are composed of Atoms of ether. -
said all materials were made of atomos and that each material had its own type of atomos and it would have the same properties as other atomos of its type. -
proposed that elements are composed of corpuscles of various types and sizes that separate into groups that make different chemical substances. -
made the law of conservation of matter and begun the conversation of what an atom is. -
accidently started the present day periodic table by trying to make common metals like lead into gold.
-
proposed all matter is composed of atoms, invisible and indestructible building blocks. -
proposed by John Dalton. Said the atom was a hard sphere and had all its components inside of the sphere. -
said that equal volumes of gas contain equal numbers of molecules and elementry gases are composed of 2 atoms. -
said when all chemical elements are arranged by atomic weight then it makes a reoccurring pattern. -
said all atoms contain electrons which were negatively charged. proposed the plum pudding model. -
found strongly radioactive elements such as, polonium and radium. -
proposed by JJ Thomson. said that a ball of positive charge would attract the electrons and the electrons would be like tiny dots in the positive charge. -
mathematically proved the existence of atoms. -
said the atom is mostly empty space. -
proposed the theory for the billiard ball structure of the atom.
-
proposed by Niels Bohr. There are rings of electrons around a nucleus just like a planet and its moons. -
found out about the electron's properties and its mass. -
said the atomic number is the number of positive charges in the atomic nucleus. -
made an equation that showed the energy level of certain atoms. -
proposed by Erwin Schrodinger and is the modern version of the atom. said that the nucleus of the atom was surrounded by a cloud of electrons. -
proposed the uncertainty principle. Particles are moving constantly in random motion and we cannot predict its path. -
said atoms also have neutrons not just electrons and protons.
