OUTSTANDING LARGE ROMAN IRON NEEDLE
OUTSTANDING LARGE ROMAN IRON NEEDLE
US $65.00
 P23.Rare large & heavy late roman/ BYZANTINE IRON FIRE STARTER STRIKING TOOL
P23.Rare large & heavy late roman/ BYZANTINE IRON FIRE STARTER STRIKING TOOL
US $49.99
 Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8027
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8027
US $23.20
 ANCIENT ROMAN IRON RARE CATAPULT BOLT RT 37
ANCIENT ROMAN IRON RARE CATAPULT BOLT RT 37
US $374.25
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8035
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8035
US $15.20
 Authentic Ancient ROMAN / MEDIEVAL ARTIFACTS - 10 UNCLEANED IRON FIBULAE 7459
Authentic Ancient ROMAN / MEDIEVAL ARTIFACTS - 10 UNCLEANED IRON FIBULAE 7459
US $95.20
 Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8063
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8063
US $31.20
 Metal Detector Find Ancient ROMAN / MEDIEVAL ARTIFACT - IRON KEY 8091
Metal Detector Find Ancient ROMAN / MEDIEVAL ARTIFACT - IRON KEY 8091
US $31.20
ROMAN to MEDIEVAL Period IRON GOUGE TOOL 2828
ROMAN to MEDIEVAL Period IRON GOUGE TOOL 2828
US $29.50
 ROMAN to MEDIEVAL Period IRON FARM HOOK or SICKLE 2780
ROMAN to MEDIEVAL Period IRON FARM HOOK or SICKLE 2780
US $34.50
 EXCELLENT ROMAN IRON PHALERA
EXCELLENT ROMAN IRON PHALERA
US $5.00
 Genuine Roman Iron Ring Intaglio size 3 US
Genuine Roman Iron Ring Intaglio size 3 US
US $185.00
NEW HCDJ Celtic Britain 60 Pix Iron Age Roman Saxon
NEW HCDJ Celtic Britain 60 Pix Iron Age Roman Saxon
US $38.99
 Roman Artifact Iron Arrowhead..52mm.. 1st-3rd century
Roman Artifact Iron Arrowhead..52mm.. 1st-3rd century
US $19.99
 Roman Artifact Iron Arrowhead..62mm.. 1st-3rd century
Roman Artifact Iron Arrowhead..62mm.. 1st-3rd century
US $19.99
 Roman Artifact Iron Arrowhead..78mm.. 1st-3rd century
Roman Artifact Iron Arrowhead..78mm.. 1st-3rd century
US $24.99
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8026
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8026
US $15.20
 Roman Iron Spearhead.
Roman Iron Spearhead.
US $.99
 AUTHENTIC ANCIENT MEDIEVAL to ROMAN IRON PILUM TIP 6449
AUTHENTIC ANCIENT MEDIEVAL to ROMAN IRON PILUM TIP 6449
US $79.20
 Authentic Ancient Artifact - Roman Iron Armor Fragments RT 155
Authentic Ancient Artifact - Roman Iron Armor Fragments RT 155
US $186.75
RARE 19THc F. H. AYRES CLOCK GOLF GAME/LG. IRON ROMAN NUMERALS IN WOOD BOX
RARE 19THc F. H. AYRES CLOCK GOLF GAME/LG. IRON ROMAN NUMERALS IN WOOD BOX
US $20.00
 Authentic Ancient ROMAN / MEDIEVAL ARTIFACTS - 12 UNCLEANED IRON FIBULAE 7458
Authentic Ancient ROMAN / MEDIEVAL ARTIFACTS - 12 UNCLEANED IRON FIBULAE 7458
US $119.20
 Late Roman Empire 1st - 4th c. AD - Iron Arrowhead 7.0cm long
Late Roman Empire 1st - 4th c. AD - Iron Arrowhead 7.0cm long
US $24.99
 ANCIENT ROMAN IRON TWEEZERS 1st-4th century AD #LF87
ANCIENT ROMAN IRON TWEEZERS 1st-4th century AD #LF87
US $59.00
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8062
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8062
US $39.20
 Authentic Ancient ROMAN / MEDIEVAL ARTIFACTS - 10 UNCLEANED IRON FIBULAE 8691
Authentic Ancient ROMAN / MEDIEVAL ARTIFACTS - 10 UNCLEANED IRON FIBULAE 8691
US $79.20
 Metal Detector Find Ancient ROMAN / MEDIEVAL ARTIFACT - IRON KEY 8090
Metal Detector Find Ancient ROMAN / MEDIEVAL ARTIFACT - IRON KEY 8090
US $39.20
 ROMAN to MEDIEVAL Period IRON ADZE HEAD 3189
ROMAN to MEDIEVAL Period IRON ADZE HEAD 3189
US $122.50
ROMAN to MEDIEVAL Period IRON FARM HOOK or SICKLE 2781
ROMAN to MEDIEVAL Period IRON FARM HOOK or SICKLE 2781
US $34.50
 ROMAN to MEDIEVAL Period IRON GOUGE TOOL 2829
ROMAN to MEDIEVAL Period IRON GOUGE TOOL 2829
US $34.50
 19th Century Roman scene cherubs nudes Cast iron Plate
19th Century Roman scene cherubs nudes Cast iron Plate
US $275.00
 Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8025
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8025
US $19.20
Roman Iron Arrowhead.
Roman Iron Arrowhead.
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 Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8061
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8061
US $79.20
 Metal Detector Find Ancient ROMAN / MEDIEVAL ARTIFACT - IRON KEY 8089
Metal Detector Find Ancient ROMAN / MEDIEVAL ARTIFACT - IRON KEY 8089
US $63.20
 ROMAN to MEDIEVAL Period IRON ADZE HEAD 3206
ROMAN to MEDIEVAL Period IRON ADZE HEAD 3206
US $82.50
ROMAN to MEDIEVAL Period IRON FARM HOOK or SICKLE 2783
ROMAN to MEDIEVAL Period IRON FARM HOOK or SICKLE 2783
US $34.50
 Ancient ROMAN to MEDIEVAL IRON NEEDLE 3999
Ancient ROMAN to MEDIEVAL IRON NEEDLE 3999
US $15.20
 Fantastic RARE and SCARCE Lot of 5 Roman Iron Fire starters 1st-5th cent. A.D.
Fantastic RARE and SCARCE Lot of 5 Roman Iron Fire starters 1st-5th cent. A.D.
US $63.00
 Roman style bronze and iron medical scalpel
Roman style bronze and iron medical scalpel
US $24.99
Roman style iron knife with bronze handle.
Roman style iron knife with bronze handle.
US $24.99
 NICE IRON ROMAN/MEDIEVAL HARPOON,SPEAR VERY RARE # 63 /393/
NICE IRON ROMAN/MEDIEVAL HARPOON,SPEAR VERY RARE # 63 /393/
US $.99
 Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8024
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8024
US $23.20
 Roman Iron Knife.
Roman Iron Knife.
US $.99
Ancient Judean Jerusalem Israel Iron Knife 100AD Roman Artifact Bible
Ancient Judean Jerusalem Israel Iron Knife 100AD Roman Artifact Bible
US $1.00
 Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8060
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8060
US $63.20
 Metal Detector Find Ancient ROMAN / MEDIEVAL ARTIFACT - IRON KEY 8088
Metal Detector Find Ancient ROMAN / MEDIEVAL ARTIFACT - IRON KEY 8088
US $47.20
 ROMAN to MEDIEVAL Period IRON ADZE HEAD 3190
ROMAN to MEDIEVAL Period IRON ADZE HEAD 3190
US $122.50
ROMAN IRON KNIFE
ROMAN IRON KNIFE
US $5.00
 ROMAN IRON KNIFE
ROMAN IRON KNIFE
US $5.00
 ROMAN to MEDIEVAL Period IRON FARM HOOK or SICKLE 2810
ROMAN to MEDIEVAL Period IRON FARM HOOK or SICKLE 2810
US $34.50
 Rare original ancient Roman iron tanged Javelin arrowhead intact spear blade
Rare original ancient Roman iron tanged Javelin arrowhead intact spear blade
US $65.00
ROMAN-MEDIEVAL IRON FIRE STARTER
ROMAN-MEDIEVAL IRON FIRE STARTER
US $125.00
 RARE ROMAN IRON SPEAR BUTT
RARE ROMAN IRON SPEAR BUTT
US $195.00
 ROMAN IRON FIBULA
ROMAN IRON FIBULA
US $45.00
 VERY RARE ROMAN OR MEDIEVAL IRON WHISTLE!!!STILL WORKING!!!!
VERY RARE ROMAN OR MEDIEVAL IRON WHISTLE!!!STILL WORKING!!!!
US $33.00
LOT OF 4 LATE ROMAN - MEDIEVAL IRON KNIFE BLADES
LOT OF 4 LATE ROMAN - MEDIEVAL IRON KNIFE BLADES
US $.99
 ANCIENT MEDIEVAL to ROMAN IRON SPEARHEAD SPEAR 6710
ANCIENT MEDIEVAL to ROMAN IRON SPEARHEAD SPEAR 6710
US $103.20
 Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8023
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8023
US $23.20
 Large Cast Iron Neptune or Poseidon Greek Roman God Fountainhead Fountain Head
Large Cast Iron Neptune or Poseidon Greek Roman God Fountainhead Fountain Head
US $59.00
Ancient Roman Byzantine Iron Socketed Arrowhead
Ancient Roman Byzantine Iron Socketed Arrowhead
US $40.00
 Roman Iron Arrowhead.
Roman Iron Arrowhead.
US $.99
 ANCIENT ROMAN IRON SOCKETED PILUM SPEAR RT 24
ANCIENT ROMAN IRON SOCKETED PILUM SPEAR RT 24
US $299.25
 AUTHENTIC ANCIENT MEDIEVAL to ROMAN IRON PILUM TIP 6448
AUTHENTIC ANCIENT MEDIEVAL to ROMAN IRON PILUM TIP 6448
US $119.20
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8059
Metal Detector Find Ancient ROMAN to MEDIEVAL ARTIFACT - IRON ARROWHEAD 8059
US $47.20
 Ancient Roman Byzantine Iron Arrowhead
Ancient Roman Byzantine Iron Arrowhead
US $18.00
 Ancient Roman Byzantine Iron Arrowhead
Ancient Roman Byzantine Iron Arrowhead
US $15.00
 Ancient Roman Byzantine Iron Arrowhead
Ancient Roman Byzantine Iron Arrowhead
US $12.00
Metal Detector Find Ancient ROMAN / MEDIEVAL ARTIFACT - IRON KEY 8087
Metal Detector Find Ancient ROMAN / MEDIEVAL ARTIFACT - IRON KEY 8087
US $47.20
 ROMAN to MEDIEVAL Period IRON FARM HOOK or SICKLE 2776
ROMAN to MEDIEVAL Period IRON FARM HOOK or SICKLE 2776
US $34.50
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Roman Iron
Chemistry Roman Numeral Question?

How do we know when to use Roman Numerals?
For example: How come we use a roman numerals in this equation Fe3+ and CN = Iron (III) cyanide, but not this one Sr2+ and Cl- = Strontium chloride

Think about the point of actually including the Roman numeral. The Roman numeral is there to distinguish between the names of several possible compounds of the same elements, like FeCl2 and FeCl3. They both can't be "iron chloride". If a metal only has one oxidation number then there is nothing to distinguish between and the Roman numeral is not needed.

So, if the metal can have more than one oxidation number, then include the Roman numeral (which corresponds to the oxidation number) in the name. Iron can have oxidation numbers of +2 and +3, but strontium only has one oxidation number, +2, and therefore doesn't need a Roman numeral in the name.



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