Unknown Properties
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Elements with insufficiently characterized properties. These are typically superheavy elements that have been synthesized in laboratories but exist for extremely short periods, making their chemical properties difficult to study.
109
Solid
Mt
Meitnerium
278.0 u
MP: —
BP: —
110
Solid
Ds
Darmstadtium
281.0 u
MP: —
BP: —
111
Solid
Rg
Roentgenium
282.0 u
MP: —
BP: —
112
Liquid
Cn
Copernicium
285.0 u
MP: —
BP: —
113
Solid
Nh
Nihonium
286.0 u
MP: —
BP: —
114
Solid
Fl
Flerovium
289.0 u
MP: —
BP: —
115
Solid
Mc
Moscovium
290.0 u
MP: —
BP: —
116
Solid
Lv
Livermorium
293.0 u
MP: —
BP: —
117
Solid
Ts
Tennessine
294.0 u
MP: —
BP: —
118
Solid
Og
Oganesson
294.0 u
MP: —
BP: —
Comparison Table
| # | Symbol | Name | Mass (u) | Melting Pt | Boiling Pt | Density | Phase |
|---|---|---|---|---|---|---|---|
| 109 | Mt | Meitnerium | 278.0 | — | — | — | Solid |
| 110 | Ds | Darmstadtium | 281.0 | — | — | — | Solid |
| 111 | Rg | Roentgenium | 282.0 | — | — | — | Solid |
| 112 | Cn | Copernicium | 285.0 | — | — | — | Liquid |
| 113 | Nh | Nihonium | 286.0 | — | — | — | Solid |
| 114 | Fl | Flerovium | 289.0 | — | — | — | Solid |
| 115 | Mc | Moscovium | 290.0 | — | — | — | Solid |
| 116 | Lv | Livermorium | 293.0 | — | — | — | Solid |
| 117 | Ts | Tennessine | 294.0 | — | — | — | Solid |
| 118 | Og | Oganesson | 294.0 | — | — | — | Solid |