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https://www.youtube.com/watch?v=lP57gEWcisYOne of the most influential philosophers. • Wrote extensively on many subjects, including politics, ethics, nature, physics, and astronomy. • Most of his writings have been lost through the ages.
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https://www.youtube.com/watch?v=_lNF3_30lUE• Matter is composed of empty space through which atoms move. • Atoms are solid, homogeneous, indestructible, and indivisible. • Different kinds of atoms have different sizes and shapes. • The differing properties of matter are due to the size, shape, and movement of atoms. • Apparent changes in matter result from changes in the groupings of atoms and not from changes in the atoms themselves.
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https://www.youtube.com/watch?v=zUDDiWtFtEMcompiled a list of all the known elements at the time.
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came up with the constant composition, stating that chemical compounds always combine in constant proportions
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noticed a flash produced by some form of radiation striking a light-producing coating that had been applied to the end of the tube, thus discovering the cathode ray
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https://www.youtube.com/watch?v=sRPejoNktKEhttps://www.youtube.com/watch?v=sRPejoNktKE(Atomic theory) All matter is composed of extremely small particles called atoms. • All atoms of a given element are identical, having the same size, mass, and chemical properties. Atoms of a specific element are different from those of any other element. • Atoms cannot be created, divided into smaller particles, or destroyed. • Different atoms combine in simple whole number ratios to form compounds. • In a chemical reaction, atoms are separated, combined, or rearranged.
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contributions to molecular theory, including what is known as Avogadro's law. which states that equal volumes of all gases, at the same temperature and pressure, have the same number of molecules
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American inventor Charles Goodyear accidentally heated a mixture of natural rubber and sulfur. The resulting reaction greatly strengthened the rubber.
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began a series of cathode ray tube experiments in the late 1890s to determine the ratio of its charge to its mass. By carefully measuring the effect of both magnetic and electric fields on a cathode ray, Thomson was able to determine the charge-to-mass ratio of the charged particle. concluded that the mass of the charged particle was much less than that of a hydrogen atom
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By accident, he discovered that the uranium salts spontaneously emitted a penetrating radiation that could be registered on a photographic plate
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discovered radioactivity, and conducted pioneering research on radioactivity.
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originated quantum theory
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devised the electron dot structur while teaching a college chemistry class
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proposed that a photon is a particle of electromagnetic radiation with no mass that carries a quantum of energy, therefore electromagnetic radiation has both wavelike and particle-like natures
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determined the charge of an electron.
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studied how positively charged alpha particles interacted with solid matter.
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discovered that atoms of each element contain a unique positive charge in their nuclei. Thus, the number of protons in an atom identifies it as an atom of a particular element
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proposed a quantum model for the hydrogen atom
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proposed an idea that eventually accounted for the fixed energy levels of Bohr’s model.
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https://www.youtube.com/watch?v=Q_h4IoPJXZw furthered the wave-particle theory proposed by de Broglie.
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concluded that it is impossible to make any measurement on an object without disturbing the object.
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https://www.youtube.com/watch?v=LdWonERbS7Yshowed that the nucleus also contained another subatomic particle, a neutral particle called the neutron
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on this beautiful day a wonderful baby boy was born #fantastic
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