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Astatine is known to bind to boron, [62] carbon, and nitrogen. [63] Various boron cage compounds have been prepared with At–B bonds, these being more stable than At–C bonds. [64] Astatine can replace a hydrogen atom in benzene to form astatobenzene C 6 H 5 At; this may be oxidized to C 6 H 5 AtCl 2 by chlorine.
All of astatine's isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.1 hours. Astatine is sometimes described as probably being a black solid (assuming it follows this trend), or as having a metallic appearance. Astatine is predicted to be a semiconductor, with a band gap of about 0.7 eV.
Astatine is known to bind to boron [24] and nitrogen. [25] Various boron cage compounds have been prepared with At–B bonds, these being more stable than At–C bonds. [ 26 ] The dipyridine-astatine(I) cation, [At(C 5 H 5 N) 2 ] + , forms ionic compounds with perchlorate [ 25 ] (a non-coordinating anion [ 27 ] ) and with nitrate , [At(C 5 H 5 ...
7 N nitrogen (N 2) use: 77.355 K: −195.795 °C: −320.431 °F WebEl: ... "Estimation Chemical Form Boiling Point Elementary Astatine by Radio Gas Chromatography".
The group of halogens is the only periodic table group that contains elements in three of the main states of matter at standard temperature and pressure, though not far above room temperature the same becomes true of groups 1 and 15, assuming white phosphorus is taken as the standard state. [n 1] All of the halogens form acids when bonded to ...
All the elements in the group are solids at room temperature, except for nitrogen which is gaseous at room temperature. Nitrogen and bismuth, despite both being pnictogens, are very different in their physical properties. For instance, at STP nitrogen is a transparent non-metallic gas, while bismuth is a silvery-white metal. [12]
Astatine-212 and astatine-216 are expected to decay either way. The most stable isotope of astatine is astatine-210, which has a half-life of about 8.1 hours. This isotope's primary decay mode is positron emission to the relatively long-lived alpha emitter, polonium-210. In total, only five isotopes of astatine have half-lives exceeding one ...
Dinitrogen is mostly unreactive at room temperature, but it will nevertheless react with lithium metal and some transition metal complexes. This is due to its bonding, which is unique among the diatomic elements at standard conditions in that it has an N≡N triple bond. Triple bonds have short bond lengths (in this case, 109.76 pm) and high ...