| A | B |
|---|
| symbol | the short way of writing an element |
| Dmitri Mendeleev | made the first periodic table of the elements |
| malleable | a property of metal; able to be thinned out by rolling or hammering without breaking apart |
| nucleus | the central part of an atom, which contains nutrons and protons |
| atomic number | the number of protons in the nucleus of an atom |
| atomic weight (or atomic mass) | the number of neutrons and protons of an atom |
| molecule | the smallest part of a compound that has all the properties of that compound |
| compound | matter made up of two or more different elements |
