Dubnium

Element 105 · Transition metal

Specimen

Atomic number: 105
Atomic mass: 268.126
State at room temperature: Solid
Melting point: Unknown
Boiling point: Unknown
Density: Unknown
Discovered: 1967

Physical data from PubChem.¹

Can I eat it?

In food and water: Never made in amounts you could eat. Only a handful of dubnium atoms have ever been made. There is not enough of it to weigh. ²

The atom

Shell	Electrons
1 (K)	2
2 (L)	8
3 (M)	18
4 (N)	32
5 (O)	32
6 (P)	11
7 (Q) outermost	2
Total	105

Configuration [Rn] 5f¹⁴ 6d³ 7s²

5f ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓

6d ↑ ↑ ↑

7s ↑ ↓

A shell diagram: each ring is an electron shell and each dot is one electron. The nucleus holds 105 protons. The outermost shell is shown in red. Electrons do not travel on rings: they fill orbitals, regions where an electron is likely to be found. The boxes are those orbitals for the electrons outside the Rn core, with one arrow per electron. This configuration is a prediction; it has not been measured.

Related elements

Sources

1

National Center for Biotechnology Information (PubChem), 2026. Periodic Table of Elements .

Atomic mass, electron configuration, melting and boiling points, density and discovery year for all 118 elements.
2
Los Alamos National Laboratory, Periodic Table of Elements, 2026. Dubnium .
- Even its atomic mass is unknown—there isn't enough of the element to weigh. ... With just a handful of atoms ever created, studies on dubnium have only been conducted on individual atoms.

Specimen

Can I eat it?

The atom

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Sources