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Chemistry Semester 1 (Unit 3: Atoms (subatomic particles (protons: are…
Chemistry Semester 1
Unit 3: Atoms
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atomic number: equivalent to the number of protons in the nucleus of an atom of that element found on periodic table
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Isotopes: atoms of the same element, but with different numbers of neutrons in the nucleus.
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Atomic Mass: is listed on the Periodic Table and is a weighted average of all the mass numbers of the isotopes of that element
History of atomic theory
Democritus: Greek philosopher who was probably the first person to theorize that matter is made up out of tiny, indestructible spheres called atoms
John Dalton : first to provide experimental and scientific evidence to back up the claim that all of matter is made up out of atoms.
J Thomson: “discovered” the electron by experimenting with a Cathode Ray Tube and his discovery of the electron led to the Plum Pudding Model of the atom (technically vert inaccurate but progress?
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Radioactivity: occurs when the nucleus of an unstable isotope of certain elements decomposes. The energy that is released are considered to be the source of radioactivity
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