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Chemistry

chemistry

TermDefinition
atom smallest particle of an element, the building blocks of matter
element pure substance, made out of one type of atom, can't be broken down into any other substances
matter anything that has mass and takes up space
periodic table shows all of the elements on Earth, arranged in order of atomic number (number of protons)
atomic structure protons, electrons, and neutrons
What is in the center of an atom? the nucleus (protons and neutrons)
protons positively charged, located in the nucleus with the neutrons
neutrons no charge (neutral), located in the nucleus with the protons.
electrons negative charge, orbit around the nucleus on outside shells (rings)
chemical formula tells the number and types of atoms present in a given molecule/compound
element a pure substance made out of only one type of atom; cannot be broken down
compound contains two or more different types of elements that are chemically bonded together, ex: H2O
molecule contains two or more different atoms that are bonded together; could be two of the same type of atom or different types, ex: O2 or H2O
atomic number the number of protons in the nucleus of an atom
atomic mass the approximate number of protons and neutrons in the nucleus of an atom
 



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