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Naming Binary Naming Binary CompoundsCompounds
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CHEMICAL FORMULASCHEMICAL FORMULAS Chemical Formula- Chemical Formula- represents a represents a
compound which includes the symbols compound which includes the symbols and numbers of atomsand numbers of atoms
SubscriptSubscript: a number in a chemical : a number in a chemical formula that shows the number of a type formula that shows the number of a type of atomof atom
• • i. e. i. e. HH2200
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BINARY COMPOUNDSBINARY COMPOUNDS
“ “Binary” means only 2 elementsBinary” means only 2 elements
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IonsIons CationsCationsPositively Charged Positively Charged
AtomsAtoms
i.e.i.e. NaNa++
AnionsAnions
Negatively Charged Negatively Charged AtomsAtoms
i.e.i.e. ClCl--
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IONIC CHARGESIONIC CHARGES Group I >Group I > 1+1+
Group II > Group II > 2+2+
Group III > Group III > 3+3+
Group IV > Group IV > 4+4+
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IONIC CHARGESIONIC CHARGES Group V >Group V > 3-3-
Group VI >Group VI > 2-2-
Group VII >Group VII > 1-1-
Group VIII >Group VIII > Noble GasesNoble Gases
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Ionic CompoundsIonic Compounds• • composed of positive andcomposed of positive and
negative ions.negative ions.
• • usually formed from a metal and usually formed from a metal and non-metal.non-metal.
• • these elements these elements areare notnot attached attached
to one another.to one another.
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• • Examples of Ionic CompoundsExamples of Ionic Compounds
NaClNaCl
CaBrCaBr22
KIKI
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A formula needs to be written in A formula needs to be written in the lowest whole number ratio.the lowest whole number ratio.
i.e.i.e. NaNa22ClCl22 > > NaClNaCl
FOR IONIC BONDS:
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Covalent CompoundsCovalent Compounds
Covalent CompoundsCovalent Compounds
• • molecules in which molecules in which elements elements shareshare electronselectrons..
• • usually composed of 2 usually composed of 2 nonmetals. nonmetals.
• • these elements these elements areare attached attached
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TYPES OF TYPES OF COMPOUNDSCOMPOUNDS
Covalent CompoundsCovalent Compounds
••ExamplesExamples
CSCS22
SiOSiO22
BFBF33
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Naming Binary Naming Binary Covalent CompoundsCovalent Compounds
Prefixes are used to show how Prefixes are used to show how many atoms are present in each many atoms are present in each molecule.molecule.
Mono=1, di=2, tri=3, tetra=4, Mono=1, di=2, tri=3, tetra=4, penta=5, hexa=6, hepta=7, penta=5, hexa=6, hepta=7, octa=8, nona=9, deca=10octa=8, nona=9, deca=10
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What word comes First in Covalent
Rule 1. (LEFT TO RIGHT) The element with the lower group number is written first in the name; the element with the higher group number is written second in the name.
– Exception: when the compound contains oxygen and a halogen, the name of the halogen is the first word in the name.
Rule 2. (BOTTOM TO TOP) If both elements are in the same group, the element with the higher period number is written first in the name.
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NAMING BINARY COMPOUNDS
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Step 1: Determine if Ionic or Covalent
1st Word = Cation 2nd Word = Anion
Element Name Element Name + “ide”
1st Word 2nd Word
Prefix + Element Name Prefix + Element Name + “ide”
IF IONIC:
IF COVALENT:
EXCEPTION:Mono not used on 1st Word
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PRACTICE
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NaBrNaBr
MgFMgF22
Sodium Sodium BromideBromide
Magnesium Magnesium FluorideFluoride
Writing Binary Writing Binary CompoundsCompounds
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Potassium Potassium ChlorChlorideide
Aluminum Aluminum OxOxideide
KClKCl
AlAl22OO33
Writing Binary Writing Binary CompoundsCompounds
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NN22OO
dinitrogendinitrogen monoxide monoxide
Writing Binary Writing Binary CompoundsCompounds
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Writing Binary Writing Binary CompoundsCompounds
COCO22 Carbon DioxideCarbon Dioxide
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PClPCl33
Phosphorous Phosphorous TriTrichlorchlorideide
Writing Binary Writing Binary CompoundsCompounds