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Chapter 4

Vocab

TermDefinition
Atoms Building block of matter that cannot be seen. Known by indirect evidence
Democritus Greek model, was first to use the term "atom"
Dalton Developed atomic theory,
Atomic Theory !.All elements are composed of atoms 2. Atoms of the same element are identical 3. Atoms of different elements are different 4. Compounds are formed by joining 2 or more atoms
Thomson Proved atoms were made up of even smaller particles. Discovered capsules(electrons), model called "plum pudding"
Subatomic Particles Mass, charge, location
Proteins Positively charged, in the nucleus, HEAVY
Neutrons No charge, in the nucleus
Electrons Negative charge; -1. Outside of the nucleus
Atomic number number of p+ in the nucleus.
Number of atomic mass sum of p+ and neutrons mass # = atomic # +neutrons
Isotopes Atoms of the same element
Bohr Discovered that electrons move in energy levels(orbits) around the nucleus. "solar system model"
1st energy level 2 e-
2nd energy level 8 e-
3rd energy level 18 e-
Electron Configuration arrangement of electrons in or piled.
Created by: anna.maddox0701
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