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Chemistry Unit Rev.

Stack #113625

Science TermsDefinition
John Dalton Atoms were spherical in shape
Ernest Rutherford atoms were mostly space
Democritus First person to define an atom
Neils Bohr Atom has a nucleus with electrons orbitting it
Protons postively charged particle in nucleus
Neutrons neutral charge, in nucleus
Electron negatively charged particle, orbits nucleus
Isotope atom with more or less neutrons than normal
Ion an atom with a postive or negative charge
Charge When an atom is positive or negative due to loss or gain of electrons
# of protons equals atomic number
# of neutrons equals atomic mass - atomic number
# of electrons equals number of protons
valence electrons electrons in outermost shell
Valence shell outer shell where bonding takes place
diatomic molecule when 2 atoms of the same atom combine
physical change change that affects size, shape, or state of matter
chemical change creates a new substancen
Acid substance that produces positive hydrogen H+ ions
Base negative ions (usually OH-) in a solution
Neutral Substance Produces Salt and water, pH of 7
Created by: loddengaardj