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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 |