Editing Boron hydride clusters (section)

==Chemical formula and naming conventions==
Borane clusters are classified as follows, where ''n'' is the number of boron atoms in a single cluster:<ref name=G&E>{{greenwood&Earnshaw2nd}} pp 151-195</ref><ref>{{Cotton&Wilkinson6th}}</ref><ref>Lipscomb W. N. ''Boron Hydrides''. Benjamin, New York (1963).</ref>
{| class="wikitable"
|-
! Cluster type!! Chemical formula!!Example!! Notes
|-
| ''hypercloso''-|| {{chem2|B_{''n''}H_{''n''}|}}|| || Unstable; derivatives are known<ref>{{cite journal | doi = 10.1002/1521-3773(20010504)40:9<1664::AID-ANIE16640>3.0.CO;2-O | journal = [[Angew. Chem. Int. Ed.]] | title = Dodeca(benzyloxy)dodecaborane, B<sub>12</sub>(OCH<sub>2</sub>Ph)<sub>12</sub>: A Stable Derivative of ''hypercloso''-B<sub>12</sub>H<sub>12</sub> | year = 2001 | last1 = Peymann | first1 = Toralf | last2 = Knobler | first2 = Carolyn B. | last3 = Khan | first3 = Saeed I. | last4 = Hawthorne | first4 = M. Frederick | volume = 40 | issue = 9 | pages = 1664–1667| pmid = 11353472}}</ref>
|-
| ''closo''-|| {{chem2|[B_{''n''}H_{''n''}](2−)}}|| [[Caesium dodecaborate]] ||
|-
| ''nido''-|| {{chem2|B_{''n''}H_{''n''+4}|}}||[[pentaborane(9)]]||
|-
| ''arachno''-|| {{chem2|B_{''n''}H_{''n''+6}|}}||[[pentaborane(11)]]|| 
|-
|''hypho''-||{{chem2|B_{''n''}H_{''n''+8}|}}|| ||Only found in adducts
|}

The [[IUPAC nomenclature of chemistry|International Union of Pure and Applied Chemistry rules]] for [[systematic nomenclature|systematic naming]] is based on a prefix denoting a class of compound, followed by the number of boron atoms and finally the number of hydrogen atoms in parentheses. Various details can be omitted if there is no ambiguity about the meaning, for example, if only one structural type is possible. Some examples of the structures are shown below.
<gallery style="text-align:center;">
Image:Borane-3D-balls.png|[[Borane]]<br>{{chem2|BH3}}
Image:Diborane-3D-balls-A.png|[[Diborane|Diborane(6)]]<br>{{chem2|B2H6}}
Image:Tetraborane-3D-balls.png|[[Tetraborane|''arachno''-Tetraborane(10)]] <br>{{chem2|B4H10}}
Image:Pentaborane(9)-from-xtal-view-1-Mercury-3D-bs.png|[[Pentaborane(9)]]<br>{{chem2|B5H9}}
Image:Decaborane(14)-from-xtal-view-1-tilt-3D-bs-17.png|[[Decaborane|Decaborane(14)]]<br>{{chem2|B10H14}}
Image:B18H22 from Xray coordinates.tif|[[Octadecaborane|Octadecaborane(22)]]<br>{{chem2|B18H22}}
Image:Iso-B18H22 from Xray coordinates.tif|''iso''-{{chem2|B18H22}}
</gallery>

<gallery style="text-align:center;">
File:Hexaborate(6)-dianion-from-xtal-3D-bs-17.png|Hexaborate(6)<br>{{chem2|[B6H6](2−)}}
File:Heptaborate(7)-dianion-from-xtal-3D-bs-17.png|Heptaborate(7)<br>{{chem2|[B7H7](2−)}}
File:Octaborate(8)-dianion-from-xtal-3D-bs-17.png|Octaborate(8)<br>{{chem2|[B8H8](2−)}}
File:Nonaborate(9)-dianion-from-xtal-3D-bs-17.png|Nonaborate(9)<br>{{chem2|[B9H9](2−)}}
File:Decaborate(10)-dianion-from-xtal-3D-bs-17.png|Decaborate(10)<br>{{chem2|[B10H10](2−)}}
File:Closo-undecaborate(11)-dianion-from-xtal-3D-bs-17.png|Undecaborate(11)<br>{{chem2|[B11H11](2−)}}
Image:Dodecaborate(12)-dianion-from-xtal-3D-bs-17.png|[[Dodecaborate|Dodecaborate(12)]]<br>{{chem2|[B12H12](2−)}}
</gallery>
The naming of anions is illustrated by 
:octahydridopentaborate, {{chem2|[B5H8]−}}
The hydrogen count is specified first followed by the boron count. The -ate suffix is applied with [[anion]]s. The ionic charge value is included in the chemical formula but not as part of the systematic name.