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Atoms REVIEW
Quiz Study Guide
Atom – the smallest particle of an element; a particle that CANNOT be cut into smaller parts
Atomic number – the # of protons in the nucleus of an atom
Atomic mass unit – a unit of mass describing the mass of an atom or molecule
Electron – NEGATIVELY CHARGED (-) particle; discovered by Thomson; least mass of all atomic particles
Electron cloud – the region where electrons are likely to be found
Isotope – atom with same # of protons, different # of neutrons; # of protons NEVER changes in an isotope
Mass number – the sum of protons and neutrons in an atom
Neutron – a particle in center of atom (subatomic) with NO CHARGE
Nucleus – the dense center of an atom; central region of an atom
Proton – a subatomic particle with a POSITIVE CHARGE (+)
All of these people contributed to the development of Atomic Theory:
Democritus, Dalton, Thomson, Rutherford, Bohr
The four (4) forces at work in the nucleus of an atom:
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Gravitational
Electromagnetic
Strong
Weak
LHughes, TFMS, 3/2016