| A | B |
|---|
| symbol | an abbreviation for an element |
| nonmetals | do not carry heat and electricity well |
| inert | doesn't combine with other elements |
| alloy | formed from melted metals that are melted together |
| atomic mass | average mass for all the isotopes of an element |
| family | elements together in a column of the Periodic Table, share properties |
| isotope | an atom of an element with the same # of protons but a different # of neutrons |
| H | hydrogen |
| He | helium |
| C | carbon |
| N | nitrogen |
| O | oxygent |
| noble gases | found in the last column, do not combine with other elements |
| row | elements have the same # of shells |
| Mendelev | created Periodic Table |
| mass number | protons plus neutrons |
| atomic number | protons only, equal to # of electrons |
| metals | left side, shiny, conduct heat and electricity, shape can be changed |
| group | family, a column in the periodic table |
