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Atoms

TermDefinition
A UNIT OF MEASUREMENT for the mass of particles in atoms. atomic mass unit (amu)
all particles are alike pure substance
area where electrons travel electron cloud
atomic mass unit-label for the mass of the subatomic particles in an atom amu
atoms are mostly empty space
Atoms of different elements are different Atoms of the same element are alike Dalton
average mass of all known isotopes(mass #) of an element atomic mass
center of the atom Nucleus
developed the term "atomos" means cannot be divided Democritus
Electrons do not travel in orbits, location of electron depends on how much energy and they move at a billion time per second. Modern Electron Cloud Theory
Energy levels with orbiting electrons like planets around the Sun, most of an Atom's mass is in the nucleus Bohr
Gold foil experiment, discovered nucleus Rutherford
Greek philosopher lead to the 2000 year death of chemistry Aristotle
How many electrons can the 1st 3 energy levels hold? 2, 8, 18
negative particle located in the cloud surrounding the nucleus electron
neutral particle located in the nucleus neutron
number of electrons in an atoms outermost energy level-determined by group number valence electron
number of protons of an element, determines the element atomic number
positive particle located in the nucleus proton
representation or model drawing of an atom
shorthand way to represent an element element symbol
substances which cannot be broken down into a simpler substance element
the rings of electrons which exist in a Bohr model-determined by the period number orbital/shells
Created by: user-2004312
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