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Science Tese

Atoms unit

TermDefinition
Orbital Probable location of an electron in an energy level
Mole 6.022 x 10^23 particles in an element: measurement
Atomic Number The number of protons in an atom
Nucleus The positively charged dense core of an atom
Isotope An element type that has a different number of neutrons than protons
Valence Electrons Electrons in the outer most energy level of an atom
Mass Number Number of protons and neutrons in an atom
Rutherford Did the gold foil experiment that said that atoms were mostly empty space with a solid core in the center and electrons floating around
Democritus Greek dude who came up with atomos which was the idea that there was a point in which something can't be broken any farther
Thompson He came up with the plumb pudding model which said that atoms were big positively charged masses with electrons spread throughout it
Bohr Discovered that electrons aren't randomly placed, they are arranged in energy levels
Proton Positive charge, mass = 1.67 x 10^-27, found in the nucleus
Electron negative charge, mass = -9.11 x 10^-31, found in the e- cloud
Neutron no charge, mass = 1.67 x 10^-27, found in the nucleus
Created by: Phoebe64