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Plato was a Greek philosopher that founded the Platonist school of thought and the Academy, -
Aristotle was a Greek philosopher and polymath during a classical time in ancient greece -
discovered the role of oxygen in combustion and respiration, proved the law of conservation, reformed the chemical nomenclature, and named hydrogen. -
all matter was comprised of indivisible and indestructible atoms with distinct masses and properties, -
if the chemicals are arranged in a certain way, the ones with similar properties occur with the elements that are similar -
Mendeleev realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, -
phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation -
Henri Becquerel Discovers Radioactivity, French physicist Henri Becquerel opened a drawer and discovered spontaneous radioactivity.
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J.J Thompson discovered the electron in 1897 -
The proton was discovered by Ernest Rutheford in the early 1900's resulted in a nuclear reaction which led to the first 'splitting' of the atom, where he discovered protons
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a historical scientific model of the atom. -
A piece of gold foil was hit with particles, which have a positive charge. Most alpha particles went right through. This showed that the gold atoms were mostly empty space. -
It carries a negative charge of 1.602176634 × 10−19 coulomb, which is considered the basic unit of electric charge. -
the electrons travel around the nucleus of an atom in orbits -
, he discovered a systematic relation between wave- length and atomic number 43, 61, and 75 (atomic numbers)
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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 -
the elementary charge of an electron using the oil-drop experiment.
