Sodium (Na) VS Rubidium (Rb)
A definitive side-by-side comparison of two essential element profiles.
VS
Main Differences
Sodium (Na) is an element in the alkali metals category with an atomic number of 11. Rubidium (Rb) is an element in the alkali metals category with an atomic number of 37.
Rubidium (Rb) is 1.6x denser than Sodium (Na). Furthermore, Sodium (Na) melts at a significantly higher temperature than Rubidium (Rb) (a difference of 58.4 Kelvin).
Where do the names come from?
Na Sodium (Na) Naming History
The name Sodium is derived from the English word ''soda''.
Rb Rubidium (Rb) Naming History
The name Rubidium is derived form the Latin ''rubidius'', meaning deepest red.
Related Comparisons
Compare
Sodium (Na)
Rubidium (Rb)
Category
Alkali Metals
Alkali Metals
Atomic Number
11
37
Symbol
Na
Rb
Atomic Mass
22.99 u
85.468 u
Group
1
1
Period
3
5
Block
s-block
s-block
Standard State (at 20°C)
solid
solid
Density
0.971 g/cm³
1.532 g/cm³
Melting Point (°C)
97.794°C
39.30°C
Melting Point (°F)
208.029°F
102.74°F
Melting Point (K)
370.87 K
312.46 K
Boiling Point (°C)
882.940°C
688°C
Boiling Point (°F)
1621.292°F
1270°F
Boiling Point (K)
1156 K
961 K
Year Discovered:
1807
1861
CAS Number
7440-23-5
7440-17-7
Origin of Name:
The name is derived from the English word ''soda''.
The name is derived form the Latin ''rubidius'', meaning deepest red.