NAMING & FORMULA WRITING
Examine the number of valence electrons for each atom:
What do you notice?
IONS AND THEIR CHARGES
TREND:
-Elements in the same group have the same number of valence electrons
-Thus elements in the same group have similar...
- Elements become stable by achieving 8 valence electrons (except for
hydrogen and helium, which achieve 2 electrons)
- No...
How many valence electrons
does each atom need to gain or
lose to achieve a full octet?
Alkali metals
lose 1
electron
Alka...
How many valence electrons
does each atom need to gain or
lose to achieve a full octet?
Group 14
elements lose or
gain 4 e...
Ion charges based on family/group:
+1 +2 +3 +/-4 -3 -2 -1 N/A
IONS AND THEIR CHARGES
BINARY IONIC COMPOUNDS
MgCl2
magnesium chlorine
ide
= magnesium chloride
1) Naming:
Magnesium oxide
Mg O
2 2+ -
SIMPLIFY!!!
= MgO
2) Writing the chemical formula:
BINARY IONIC COMPOUNDS
PbI4
lead iodide
Pb I
41
Check charge on non-metal
ion to see if you need to
“un-simplify”
(IV)
= lead (IV) iodide
IONIC C...
Copper (II) chloride
Cu Cl
2 1+ -
= CuCl2
2) Writing the chemical formula:
Copper (II) chloride
IONIC COMPOUNDS WITH MULTI...
Na2SO4
sodium sulfate
= sodium sulfate
1) Naming:
IONIC COMPOUNDS WITH POLYATOMIC IONS
Calcium chlorate
Ca ClO3
2 1+ -
= Ca(ClO3)2
2) Writing the chemical formula:
IONIC COMPOUNDS WITH POLYATOMIC IONS
( )
ACIDS
Polyatomic ions have modified names in acids
Polyatomic ion
name
Acid anion name Example
sulfate sulfuric H2SO4 sulf...
H2SO4(aq)
Sulfuric acid
OXYACID
Most acids have hydrogen
HCl(aq)
Hydrochloric acid
BINARY ACID
ACIDS
1) Naming:
bromic acid
BrO3H
1 1+ -
= HBrO3(aq)
ACIDS
2) Writing the chemical formula:
mono
di
tri
tetra
penta
hexa
hepta
octa
nona
deca
NAMING…
• Name both elements (change the
ending of the element on the ri...
mono
di
tri
tetra
penta
hexa
hepta
octa
nona
deca
Writing the name: PCl5
MOLECULAR COMPOUNDSNON-METAL + NON-METAL
phosphor...
Writing the formula: sulfur tetroxide
MOLECULAR COMPOUNDSNON-METAL + NON-METAL
S O1 4
= SO4
Notice how “tetroxide” is NOT ...
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02 naming and formula writing

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02 naming and formula writing

  1. 1. NAMING & FORMULA WRITING
  2. 2. Examine the number of valence electrons for each atom: What do you notice? IONS AND THEIR CHARGES
  3. 3. TREND: -Elements in the same group have the same number of valence electrons -Thus elements in the same group have similar reactivity Examine the number of valence electrons for each atom: Example: All alkali metals have one valence electron IONS AND THEIR CHARGES
  4. 4. - Elements become stable by achieving 8 valence electrons (except for hydrogen and helium, which achieve 2 electrons) - Noble gases are non-reactive because they have 8 electrons - This is called the Octet Rule The number of valence electrons can determine reactivity: IONS AND THEIR CHARGES
  5. 5. How many valence electrons does each atom need to gain or lose to achieve a full octet? Alkali metals lose 1 electron Alkali earth metals lose 2 electrons Group 13 elements lose 3 electrons Group 14 elements lose or gain 4 electrons IONS AND THEIR CHARGES
  6. 6. How many valence electrons does each atom need to gain or lose to achieve a full octet? Group 14 elements lose or gain 4 electrons Group 15 elements gain 3 electrons Group 16 elements gain 2 electrons Halogens gain 1 electron Noble gases already have a full octet IONS AND THEIR CHARGES
  7. 7. Ion charges based on family/group: +1 +2 +3 +/-4 -3 -2 -1 N/A IONS AND THEIR CHARGES
  8. 8. BINARY IONIC COMPOUNDS MgCl2 magnesium chlorine ide = magnesium chloride 1) Naming:
  9. 9. Magnesium oxide Mg O 2 2+ - SIMPLIFY!!! = MgO 2) Writing the chemical formula: BINARY IONIC COMPOUNDS
  10. 10. PbI4 lead iodide Pb I 41 Check charge on non-metal ion to see if you need to “un-simplify” (IV) = lead (IV) iodide IONIC COMPOUNDS WITH MULTIVALENT METALS 1) Naming:
  11. 11. Copper (II) chloride Cu Cl 2 1+ - = CuCl2 2) Writing the chemical formula: Copper (II) chloride IONIC COMPOUNDS WITH MULTIVALENT METALS
  12. 12. Na2SO4 sodium sulfate = sodium sulfate 1) Naming: IONIC COMPOUNDS WITH POLYATOMIC IONS
  13. 13. Calcium chlorate Ca ClO3 2 1+ - = Ca(ClO3)2 2) Writing the chemical formula: IONIC COMPOUNDS WITH POLYATOMIC IONS ( )
  14. 14. ACIDS Polyatomic ions have modified names in acids Polyatomic ion name Acid anion name Example sulfate sulfuric H2SO4 sulfuric acid chlorate chloric HClO3 chloric acid carbonate carbonic H2CO3 carbonic acid phosphate phosphoric H3PO4 phosphoric acid ACIDS
  15. 15. H2SO4(aq) Sulfuric acid OXYACID Most acids have hydrogen HCl(aq) Hydrochloric acid BINARY ACID ACIDS 1) Naming:
  16. 16. bromic acid BrO3H 1 1+ - = HBrO3(aq) ACIDS 2) Writing the chemical formula:
  17. 17. mono di tri tetra penta hexa hepta octa nona deca NAMING… • Name both elements (change the ending of the element on the right to “ide” • Put prefixes in front of the element • Eliminate the prefix “mono” if it is attached to the first element (the element on the left) WRITING THE FORMULA… • Write the symbols of the elements • Convert the prefixes to subscripts MOLECULAR COMPOUNDSNON-METAL + NON-METAL Prefixes 1 2 3 4 5 6 7 8 9 10
  18. 18. mono di tri tetra penta hexa hepta octa nona deca Writing the name: PCl5 MOLECULAR COMPOUNDSNON-METAL + NON-METAL phosphorus chlorine ide chloride 1 RULE #3: Eliminate the prefix “mono” if it is attached to the first element (the element on the left) = phosphorus pentachloride
  19. 19. Writing the formula: sulfur tetroxide MOLECULAR COMPOUNDSNON-METAL + NON-METAL S O1 4 = SO4 Notice how “tetroxide” is NOT spelt as tetraoxide. The “a” in the prefix is eliminated when its followed by an “o”

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