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Chemistry Vocab

QuestionAnswer
atomic mass average mass of the isotopes of the element
atomic number the number of protons in each atom of an element
Chemical symbol one or two letters that represent the elements
element a substance containing only one kind of atom
compound a substance containing two or more kinds of atoms bonded together
period horizontal rows on the periodic table representing energy levels
group vertical columns on the periodic table representing valence electrons
physical change alters the form or appearance of a substance, but does not change it into a new substance
chemical change a change in matter that produces one or more new substances
precipitate a solid that forms during a chemical reaction
endothermic reaction more energy is required to break the bonds than is given off by forming new substances (cooler)
exothermic reaction more energy is given off by forming new substances then what is required to break the bonds (warmer)
Electron negatively charged subatomic particle
Proton positively charged subatomic particle found in the nucleus
Neutron subatomic particle with no charge found in the nucleus
atom smallest unit of matter
Created by: KimRoush
 

 



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