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Ch 2 vocab
| Term | Definition |
|---|---|
| chemical symbol | International symbol for each element consisting of 1 or 2 letters |
| metal | hard, shiny, malleable, ductile, and good conductors of heat and electricity |
| non-metal | gases or brittle solids at room temperature |
| alkali metals | highly reactive, particularly with water and oxygen |
| alkaline earth metals | will burn in air if heated |
| atomic mass | mass of an average atom of an element |
| atomic number | number of protons in the nucleus of each atom of an element |
| halogens | non-metals that are highly reactive |
| metalloid | element that shares some properties with metals and some properties with non-metals |
| multiple ion charge | more than one ion charge |
| noble gases | most stable and unreactive elements in the periodic table |
| Bohr model | diagram that shows the electron arrangement around the nucleus |
| electron shell | region surrounding the nucleus of an atom |
| valence electron | electrons in the outermost electron shell |
| valence shell | outermost electron shell |