Rutherfordium (Rf) VS Dubnium (Db)
A definitive side-by-side comparison of two essential element profiles.
VS
Main Differences
Rutherfordium (Rf) is an element in the transition metals category with an atomic number of 104. Dubnium (Db) is an element in the transition metals category with an atomic number of 105.
Dubnium (Db) is 1.3x denser than Rutherfordium (Rf).
Where do the names come from?
Rf Rutherfordium (Rf) Naming History
Rutherfordium is named in honour of New Zealand Chemist Ernest Rutherford, one of the first to explain the structure of atoms.
Db Dubnium (Db) Naming History
Dubnium is named for the Russian town Dubna.
Related Comparisons
Compare
Rutherfordium (Rf)
Dubnium (Db)
Category
Transition Metals
Transition Metals
Atomic Number
104
105
Symbol
Rf
Db
Atomic Mass
[267] u
[268] u
Group
4
5
Period
7
7
Block
d-block
d-block
Standard State (at 20°C)
solid
solid
Density
23.2* g/cm³
29.3* g/cm³
Melting Point (°C)
N/A
N/A
Melting Point (°F)
N/A
N/A
Melting Point (K)
2400* K
null K
Boiling Point (°C)
N/A
N/A
Boiling Point (°F)
N/A
N/A
Boiling Point (K)
5800* K
null K
Year Discovered:
1964
1968
CAS Number
53850-36-5
53850-35-4
Origin of Name:
Rutherfordium is named in honour of New Zealand Chemist Ernest Rutherford, one of the first to explain the structure of atoms.
Dubnium is named for the Russian town Dubna.