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The Alchemists thought that all metals were made up of Sulfur and Mercury and could be transformed into Gold. -
He theorized that everything was made up of atoms and believed that atoms were uniform, solid and indestructible. -
He theorized that geometric forms serve as atoms. -
He said that elements are composed 'corpuscles' of different types and sizes. -
He discovered that oxygen was the main component in combustion. -
He proposed that all matter was composed of atoms, which were indivisible and indestructible building blocks. -
Dalton thought that atoms were the smallest particles but solid spheres, like billiard balls.
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He stated that equal volumes of gasses at the same temperature and pressure have the same number of molecules. -
He stated that a table that has elements arranged in order of increasing atomic weight will result in the table showing a reoccurring pattern. He created the Periodic Table. -
He used equations to figure out the probability of an electron being in one place. -
JJ discovered the electron. -
They discovered the highly radioactive elements Radium and Polonium. -
JJ Thompson created this model stating that atoms are spheres of positively charged mater in which electrons are embedded. -
He mathematically proved the existence of atoms. -
He said that there is a fundamental electric charge, electrons, and positively charged particles in the nucleus called protons. -
He established what the atomic number is. -
He proposed the reason why electrons stably orbit the nucleus. -
This model said that atoms were like solar systems. With the nucleus being the sun and the electrons being the planets. -
He established that the mass of an atom is concentrated in the nucleus and also that electrons orbited the nucleus. -
Erwin Schrödinger created this model stating that a nucleus is surrounded by electrons at various levels in orbital shells.
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He developed a mathematical way of expressing the energy levels of electrons in atoms
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He discovered that atoms consisted not only of protons and electrons but also neutrons.
