▁coordinates ▁are ▁provided ▁for ▁many ▁National ▁Register ▁properties ▁and ▁districts ; ▁these ▁locations ▁may ▁be ▁seen ▁together ▁in ▁a ▁map . ▁ ▁There ▁are ▁ 1 9 5 ▁properties ▁and ▁districts ▁listed ▁on ▁the ▁National ▁Register ▁in ▁the ▁county , ▁including ▁ 4 ▁National ▁Historic ▁Land marks . ▁ ▁There ▁are ▁ 1 8 ▁properties ▁that ▁have ▁been ▁removed ▁from ▁the ▁register . ▁ ▁Current ▁list ings ▁ ▁| } ▁ ▁Form er ▁list ings ▁Se vent een ▁other ▁properties ▁were ▁once ▁listed , ▁but ▁have ▁now ▁been ▁removed : ▁ ▁| } ▁ ▁See ▁also ▁▁ ▁List ▁of ▁National ▁Historic ▁Land marks ▁in ▁Tennessee ▁ ▁National ▁Register ▁of ▁Historic ▁Places ▁list ings ▁in ▁Tennessee ▁ ▁References ▁▁▁ 0 1 ▁Sh el by ▁Category : Build ings ▁and ▁structures ▁in ▁Sh el by ▁County , ▁Tennessee ▁Category : Sh el by ▁County , ▁Tennessee <0x0A> </s> ▁Iron ▁pent ac ar b ony l , ▁also ▁known ▁as ▁iron ▁car b ony l , ▁is ▁the ▁comp ound ▁with ▁formula ▁▁ ▁() 5 . ▁Under ▁standard ▁conditions ▁Fe ( CO ) 5 ▁is ▁a ▁free - flow ing , ▁st raw - color ed ▁liquid ▁with ▁a ▁p ung ent ▁od our . ▁ ▁Old er ▁samples ▁appear ▁dark er . ▁ ▁This ▁comp ound ▁is ▁a ▁common ▁prec ursor ▁to ▁diverse ▁iron ▁comp ounds , ▁including ▁many ▁that ▁are ▁useful ▁in ▁small ▁scale ▁organ ic ▁synth esis . ▁ ▁Properties ▁Iron ▁pent ac ar b ony l ▁is ▁a ▁hom ole ptic ▁metal