| A | B |
|---|
| atoms | the basic units of all matter |
| chemical reaction | a process that produces one or more stubstances that are different from the original substances |
| electron | negitivly charged particals |
| nucleus | the central part of the atom |
| proton | positivly charged particals |
| neutron | a partical with no charge |
| element | any substance made of only one kind of atom |
| X-ray diffraction machine | shows the arrangement of particals within a crystal |
| partical accelarators | these machines are built under ground to help scientist study the nucleus of atoms |
| element symbols | all elements have abbreviations or symbols to represent their names |
| periodic table | the chart that shows the different elements |
