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<p>bond is also the lowest in the group, especially for ionic compounds of the type R<sub>2</sub>TlX. Thallium forms the stable [Tl(CH<sub>3</sub>)<sub>2</sub>]<sup>+</sup> ion in aqueous solution; like the isoelectronic <a href="page.php?w=dimethylmercury">Hg(CH<sub>3</sub>)<sub>2</sub></a> and [Pb(CH<sub>3</sub>)<sub>2</sub>]<sup>2+</sup>, it is linear. Trimethylthallium and triethylthallium are, like the corresponding gallium and indium compounds, flammable liquids with low melting points. Like indium, thallium <a href="page.php?w=cyclopentadienyl">cyclopentadienyl</a></p><p>
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