Calcium (Ca) VS Strontium (Sr)
A definitive side-by-side comparison of two essential element profiles.
VS
Main Differences
Calcium (Ca) is an element in the alkaline earth metals category with an atomic number of 20. Strontium (Sr) is an element in the alkaline earth metals category with an atomic number of 38.
Strontium (Sr) is 1.7x denser than Calcium (Ca). Furthermore, Calcium (Ca) melts at a significantly higher temperature than Strontium (Sr) (a difference of 65.0 Kelvin).
Where do the names come from?
Ca Calcium (Ca) Naming History
The name Calcium is derived from the Latin ''calx'' meaning lime.
Sr Strontium (Sr) Naming History
Strontium is named after Strontian, a small town in Scotland.
Related Comparisons
Compare
Calcium (Ca)
Strontium (Sr)
Category
Alkaline Earth Metals
Alkaline Earth Metals
Atomic Number
20
38
Symbol
Ca
Sr
Atomic Mass
40.078 u
87.62 u
Group
2
2
Period
4
5
Block
s-block
s-block
Standard State (at 20°C)
solid
solid
Density
1.55 g/cm³
2.64 g/cm³
Melting Point (°C)
842°C
777°C
Melting Point (°F)
1548°F
1431°F
Melting Point (K)
1115 K
1050 K
Boiling Point (°C)
1484°C
1377°C
Boiling Point (°F)
2703°F
2511°F
Boiling Point (K)
1757 K
1655 K
Year Discovered:
1808
1790
CAS Number
7440-70-2
7440-24-6
Origin of Name:
The name is derived from the Latin ''calx'' meaning lime.
Strontium is named after Strontian, a small town in Scotland.