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Information valid for Rf-Unq-261 unless otherwise noted

Basic Information

Symbol: Rf-Unq
Atomic Number: 104
Mass: (261.0)
Melting Point: Unknown
Boiling Point: Unknown
Number of Protons/Electrons: 104
Number of Neutrons: 157
Classification: Transition Metal
Crystal Structure: Unknown
Density @ 293 K: Unknown
Color: Unknown
IUPAC Name: Dubnium (Db)
ACS Name: Rutherfordium (Rf)
Due to the naming dispute over this element, this site will use the IUPAC Systematic Naming Scheme

Atomic Structure

[Bohr Model of Unnilquadium]
Number of Energy Levels: 7

  1. First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 32
    Fifth Energy Level: 32
    Sixth Energy Level: 10
    Seventh Energy Level: 2


Isotope Half Life
Unq-257 4.7 seconds


Date of Discovery: 1969
Discoverer: A. Ghiorso
Name Origin: Un (one) nil (zero) quad (four) ium
Uses: No uses known
Obtained From: Man-made