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15 terms

Science Terms Ch.8

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nucleus
the central core of an atom
proton
a particle in the nucleus of an atom that has a positive charge
neutron
a particle in the nucleus of an atom that has no charge
electron
a particle in the nucleus of an atom that has negative charge
element
a substance that is made of only one particular type of atom and cannot be broken down into simpler substances
chemical symbol
one or two letters that represent an elemen's name
periodic table
a chart that arranges all the known elements by their properties
molecule
two or more atoms joined together
compound
a molecule that consists of two or more diffrent elements
chemical formula
a group of chemical symbols and numbers that describes the types and numbers of elements present in a molecule
density
the measure of how compact matter is
chemical reaction
the rearrangement of atoms within molecules with diffrent properties
reactant
a substance present at the start of a chemical reaction
product
a substance produced by a chemical reaction
technology
the application of knowledge to accomplish a goal