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The alchemists said that all metals were formed from two elements mercury and sulfur. -
Said all matter is made up of small units called atoms. Moved in infinite numbers till time stopped -
Plato was the first person to come up with the atomic theory -
matter was fundamentally constructed out of atoms -
said that matter was not created or destroyed in chemical reactions -
all matter is made of atoms and all atoms of an element are identical in mass -
chemical elements that are arranged by atomic weight occur after seven elements -
elements were related to their mass in a periodic way. -
Einstein was a theoretical physicist born in Germany, he is one of the most important and influential Physicists of all time and made many important contributions. said that any liquid is made up of atoms. -
electrically charged released from a material when the material absorbs electromagnetic radiation. -
On a overcast day in 1896 Henri Becquerel opened a drawer and discovery spontaneous radioactivity on accident. -
Used cathode rays to find the carrier of electrical properties -
atoms and molecules can emit or absorb energy in discrete quantities only. -
negatively charged particles in a pack of positive charge -
When a piece of gold was hit with particles most of the particles passed through the gold foil showing gold atoms are mostly empty space. -
Electrons circle the nucleus in a path called a orbit -
The atomic number of an element is the number of positive charges. -
Ernest Rutherford discovery the proton in the early 1900's. During his experiments he was the first person to split an atom. -
The electron is negatively charged
1.602176634 × 10−19 coulomb -
Robert Millikan was an American physicist that discovered the falling drop method. -
equation that governs the function of a quantum-mechanical system -
we cannot know both the position and speed of a particle, such as a photon or electron, with perfect accuracy -
the core contained a uncharged particle