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105 Db Dubnium 268

Dubnium

TRANSITION METAL
Bohr Model: Electrons arranged in energy shells around the nucleus.

Dubnium is a chemical element with symbol Db and atomic number 105. It is named after the town of Dubna in Russia (north of Moscow), where it was first produced. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, dubnium-268, has a half-life of approximately 28 hours.

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Quick Facts

Atomic Number 105
Period 7
Group 5
Phase Solid
Appearance Unknown
About Transition Metals

Transition metals are elements with partially filled d-orbitals. They are hard, have high melting points, and often form colored compounds.

History

Discovered By Joint Institute for Nuclear Research
Named By Unknown

Physical Properties

Atomic Mass 268
Density 29.3 g/L
Molar Heat N/A J/(mol·K)
Phase Transition (Melting & Boiling Points)

Dubnium phase transition data is unavailable.

Atomic Properties

Electron Config *[Rn] 5f14 6d3 7s2
Electronegativity N/A
Electron Affinity N/A kJ/mol
Ionization Energy N/A kJ/mol
Orbital Filling Diagram
This diagram visualizes electron configuration according to the Aufbau principle and Hund's rule. Boxes represent orbitals (s, p, d, f), while arrows indicate electrons with spin up or down. Electrons fill lower energy levels first and occupy orbitals singly before pairing.

Photograph

Image of Dubnium Source: Wikipedia

External Resources

Wikipedia PubChem Royal Society of Chemistry Periodic Videos (YouTube)

Study Guide

Atomic Number

The number of protons in the nucleus, which defines the element.

Atomic Mass

The average mass of an atom, including protons and neutrons.

Electronegativity

A measure of how strongly an atom attracts electrons in a bond.

Ionization Energy

The energy required to remove an electron from an atom.

Electron Config

The arrangement of electrons in the atom's energy shells.