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He theorized that all material bodies are made up of indivisibly small atoms. -
he was a Greek philosopher born in Athens during the Classical period in Ancient Greece. He founded the Platonist school. -
Aristotle was a Greek philosopher and polymath during the Classical period in Ancient Greece. Taught by Plato. -
Lavoisier is most noted for his discovery of the role oxygen plays in combustion. He recognized and named oxygen and hydrogen. -
The alchemists believed that all metals were formed from two principles — mercury and sulfur. -
Dalton's atomic theory suggested that all matter was comprised of indivisible and indestructible atoms with distinct masses and properties -
if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements. -
Dmitri Mendeleev, a Russian chemist and teacher, devised the periodic table a comprehensive system for classifying the chemical elements. -
Albert Einstein was a German-born theoretical physicist, widely acknowledged to be one of the greatest and most influential physicists of all time. -
phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation -
Henri Becquerel Discovers Radioactivity. In one of the most well-known accidental discoveries in the history of physics -
During the 1880s and '90s scientists searched cathode rays for the carrier of the electrical properties in matter -
The proton was discovered by Ernest Rutherford in the early 1900's. During this period, his research resulted in a nuclear reaction which led to the first 'splitting' of the atom.
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According to Planck's quantum theory, Different atoms and molecules can emit or absorb energy in discrete quantities only. -
the pludding model is a historical scientific model of the atom. The plum pudding model is defined by electrons surrounded by a volume of positive charge -
electron, lightest stable subatomic particle known. It carries a negative charge of -
A piece of gold foil was hit with alpha particles, which have a positive charge. Most alpha particles went right through. This showed that the gold atoms were mostly empty space.
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the electrons encircle the nucleus of the atom in specific allowable paths called orbits. -
In 1914 Moseley published a paper in which he concluded that the atomic number is the number of positive charges in the atomic nucleus -
we cannot know both the position and speed of a particle, such as a photon or electron, with perfect accuracy; -
In May 1932 James Chadwick announced that the core also contained a new uncharged particle, which he called the neutron. Chadwick was born in1891 in Manchester, England. -
Robert Millikan was a physicist who discovered the elementary charge of an electron using the oil-drop experiment. -
The Schrödinger equation is a linear partial differential equation that governs the wave function of a quantum-mechanical system.
