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25 Cards in this Set

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Ionic Compound
high melting points, good conductors of electricity
molecular compounds
lower melting points tend to be gases, low melting solids. do not conduct electricity
what are ionic compounds made of?
an extended array of positively and negatively charged ions
what are moleular compounds made of?
molecules
how is an ionic bond formed?
transfer of one or more elctrons from one atom or group of atoms to another atom or group of atoms
how is a covalent bond formed?
chemical bond formed through the sharing of one or more pairs of electrons between two atoms
valence electron
electron in the outermost shell of a representative element or noble gas element
What is the octete rule?
while forming compounds atomos of elements gain or lose or share of electrons in a way to produce a noble gas configuration for each of the atoms invovled.
How does an atom gain a positive charge?
loss of electrons
how does an atom gain a negative charge
gain of a electrons
when are isoelectronic species
when an atom and an ion or two ions have the same number and configuration of electrons
ionic bonds
one element is a metal and the other a nonmetal
how do you name binary ionic compounds?
full name of metallic element followed by the stem of the nonmettalic element and the suffix ide.
covalent bond
both elements are similar or identical atoms. most often two non metals
how does a covalent bond form?
electron sharign
what is the basic structural unit of covalent compounds
molecular compounds
what states can molecular compounds be at room temp?
solid, liquids or gases
what statescan ionic compounds be at room temperature
solids
coordinate covalent bond
covalent bond in which both electrons of a shared pair come from one of the two atoms involved in teh bond
VSEPR theory
set of procedures for predicting molecular geometry using information in the lewis structure
what is the geometry of two electron pairs
linear 180 degrees apart
what is the geometry of three electron pairs
trigonal planar 120 angles. angular : when one of the three electron pairs is nonbonding
what is the geometry of 4 electron pairs
tetrahedral 109 egrees

one nonbonding pair trigonal pyramidal

two nonbonding pairs angular
naming binary molecular compounds
full name of lower electronegative first, followed by seperate words containg stem of more electronegative and suffix ide. with numerical prefixes giving numbers of atoms before names of the nonmentals
electronegativity
measure of the relative attractaion that an atom has for the shared electrons in a bond