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He introduced that atoms are the basic building blocks of matter -
He theorizes that solid forms of matter are composed of indivisible elements shaped like triangles -
The Alchemists believed that all metals were formed form mercury and sulfur. -
Gailileo showed that Venus has phases like the moon. -
Robert Boyle said that all matter was composed of tiny particles that he called corpuscles -
He said that matter was composed of atoms that were not created or destroyed during chemical reactions -
He claimed that all matter was comprised of indivisible and indestructible atoms with distinct masses and properties -
dalton thought atoms were the smallest particles of matter, he envisioned them as solid, hard spheres, like billiard balls -
He said that equal volumes of gasses at the same temperature and pressure contain the same number of molecules -
He devised the periodic classification of the chemical elements -
He discovered that atoms were made up of smaller components -
They discovered. the strongly radioactive elements, polonium and radium -
The plum pudding model depicts the electrons as negatively-charged particles embedded in a sea of positive charge. The structure of Thomson's atom is analogous to plum pudding, an English dessert -
He said that all liquid is made up of molecules -
He described the atom as having a tiny dense, and positively charged core called the nucleus -
He confirmed that electrons existed -
He said that the electron was able to occupy only certain orbits around the nucleus -
He said that the atomic number of positive charges in the atomic nucleus. -
He said that a wave equation that accurately calculated the energy levels of electrons in atoms -
It represents the area around an atom's nucleus where electrons are most likely to be found. -
He proved the existence of neutrons.