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CH. 17-18
Term | Definition |
---|---|
element | any pure substance that is made of only one kind of atom. |
alchemy | aspects of chemistry, philosphy, religion, metallurgy, medicine and art. |
periodicity | the repitition of certain properties at regular intervals when elements were placed in the order of atomic mass |
metals | belong to families with relitivley few valience electrons. |
nonmetals | hold electrons tightly, properties are very different from metals. |
periods | ---- horizontal rows of elements ---- |
electronn affinity | deals with the strength of the attracton of electrrons |
chemical symbols | berzelium's notation consisting of one or two letters derived from the elements name |
monatomic | occur as single atoms |
diatomic | hydrogen nitrogen oxygen fluorine chlorine bromine iodine |
octet rule | full 8 electrons in their valence electricity level |
electron affinity | how well it holds and attracts electrons |
electronegativity | an atoms ability to attract and hold atoms when bonded to other atoms |
ionic bond | between metals and nonmetals |
covalent bond | mostly between nonmetals |
metallic bond | atoms bond by sharing their easily lost electrons among atoms |
Lewis structure | molecular notation |
double bonds | stronger than single bonds |
triple bonds | each atom must share three electrons to complete its octet |
polyatomic molecules | molecules made up of three or more atoms |
polar covalent bond | uneven electron sharing |
nonpolar bonds | bonds with no polarity. formed by diatomic elements |
covalent compounds | consist of covalently bonded molecules |
ionic compounds | formed by ionic bonds |
crystal lattice | mobile ions clump together with opposite charges |
formula unit | the smallest ratio of elements in an ionic compound |
unit cells | groupings of ions |
electron sea theory | a model of the bonding of metals and their properties |