atom - the smallest part of an element that still has the properties of an element, electrons - negatively charged particles, protons - positively charged particles, neutrons - particles with no electric charge, nucleus - small dense center that has a positive charge and is surrounded by moving electrons, atomic number - the number of protons in the nucleus of an atom, atomic mass - the total number of protons and neutrons in an atoms nucleus , atomic theory - the idea that everything is made of small particles, periodic table - where elements are organized according to the atomic number and physical properties, element - building blocks of matter ,the ingredients that make up all of the other substances , metals - are elements that are shiny and conduct heat and electricity well, Nonmetals - poor conductors of heat and electricity are often dull and brittle, metaloids - elements that have some properties of metals and some properties of nonmetals, group - each vertical column of elements on the periodic table, period - each horizontal row on the periodic table, compound - when two or more elements join chemically, new substance with properties diffrent from those of the elements compose it , molecule - smallest particle of a compound that still has the properties of that compound, chemical reaction - the process in which atoms are rearranged to produce new substances,

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