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unit 4 chem
madalyn's final vocab reciew
| unit four | |
|---|---|
| atom | the smallest part of an element that retains its identity durring a chemical reaction |
| Dalton's atomic theory | 1. all elements are composed of atoms 2.Atoms of the same element are identical. Each element's atoms are unique 3.atoms of diffrent elements can mix together, or chemically react in whole number ratios that don't change4.atoms don't chnge durring rxns |
| electron | negativelly charged subatomic particles |
| cathode ray | stream of electrons |
| protons | positively charged particles, found in the nucleus |
| neutrons | subatomic particle with no charge and a mass nearly eaqual to that of a proton number of neutrons is the mass #- atomic # |
| nucleus | tiny central core of an atom composed of protons and neurons |
| atomic number | number of protons in thenucleus of an element |
| mass number | total number of protons and neutrons in an atom - rounded atomic mass to whole # |
| isotopes | atoms with the same number of protons and diffrent number of neurtrons |
| period | horizontal row on periodic table 7 periods |
| group | vertical collum on periodic table in each elements share similar physical properties |
| periodic table | an arangement of elements in wich atoms are separated based on their properties |
| atomic mass | weighted average mass of an atom in a naturally occurring sample of the element |
| atomic mass unit (amu) | 1/12 the mass of a carbon 12 atom |
Created by:
madbee010
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