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CH. 17-18

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
Created by: colinamason