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17 Cards in this Set

  • Front
  • Back
chemical properties
properties of a substance that describe how it changes while being converted into a substance
chemical change
when two or more substances unite to break apart chemicaly
element
the simplest type of substance
atoms
the smallest particles of matter
an element cannot be broken down to anything smaller than...
one particular kind of atom
compound
a new substance formed from the chemical union of two or more elements
chemical reaction
the process of forming a chemical bond
nucleus
the core of an atom that contains protons and neutron
proton
has a positive charge
atomic number
the number of protons found in the nucleus of a particular atom
electrons
have negative electric charges
neutrons
have no electric charge
scientific notation
using exponents to write out extremely large or small numbers
atomic mass of an element
is approximately equal to the sum of the number of protons and neutrons found in the nucleus of an average atom of that element
stable atom
has an equal number of electrons and protons
molecule
two or more atoms that are chemically united
chemical symbol
used to identify elements