Editing Group 7 element (section)

== Physical properties ==

The trends in group 7 follow, although less noticeably, those of the other early d-block groups and reflect the addition of a filled f-shell into the core in passing from the fifth to the sixth period. All group 7 elements crystallize in the [[hexagonal close packed]] (hcp) structure except manganese, which crystallizes in the [[body centered cubic]] (bcc) structure. Bohrium is also expected to crystallize in the hcp structure.<ref name=bh-hcp>{{cite journal|doi=10.1103/PhysRevB.84.113104|title=First-principles calculation of the structural stability of 6d transition metals|year=2011|last1=Östlin|first1=A.|last2=Vitos|first2=L.|journal=Physical Review B|volume=84|issue=11|page=113104 |bibcode=2011PhRvB..84k3104O}}</ref>

The table below is a summary of the key physical properties of the group 7 elements. The question-marked value is predicted.<ref name="Haire" />

{| class="wikitable centered plainrowheaders" style="text-align:center;"
|+Properties of the group 7 elements | Properties of the group 7 elements
! scope="col" | Name
! scope="col" | Mn, [[manganese]]
! scope="col" | Tc, [[technetium]]
! scope="col" | Re, [[rhenium]]
! scope="col" | Bh, [[bohrium]]
|-
! scope="row" |[[Melting point]]
| 1519 K (1246&nbsp;°C) || 2430 K (2157&nbsp;°C) || 3459 K (3186&nbsp;°C) || {{Unknown}}
|-
! scope="row" |[[Boiling point]]
| 2334 K (2061&nbsp;°C) || 4538 K (4265&nbsp;°C) || 5903 K (5630&nbsp;°C) || {{Unknown}}
|-
! scope="row" |[[Density]]
| 7.21&nbsp;g·cm<sup>−3</sup> || 11&nbsp;g·cm<sup>−3</sup> || 21.02&nbsp;g·cm<sup>−3</sup> || 26-27&nbsp;g·cm<sup>−3</sup>?<ref name=density>{{cite journal |last1=Gyanchandani |first1=Jyoti |last2=Sikka |first2=S. K. |title=Physical properties of the 6 d -series elements from density functional theory: Close similarity to lighter transition metals |journal=Physical Review B |date=10 May 2011 |volume=83 |issue=17 |pages=172101 |doi=10.1103/PhysRevB.83.172101 |bibcode=2011PhRvB..83q2101G }}</ref><ref name=kratz>{{cite book |last1=Kratz |last2=Lieser |title=Nuclear and Radiochemistry: Fundamentals and Applications |date=2013 |page=631 |edition=3rd}}</ref>
|-
! scope="row" |Appearance
| silvery metallic || silvery-gray ||  silvery-gray || {{Unknown}}
|-
! scope="row" |[[Atomic radius]]
|  127 pm || 136 pm || 137 pm || 128 pm?<ref name="Haire" />
|}