| Element (Atom) Name | Calcium |
| Symbol | Ca |
| Physical state at room temperature | Solid |
| Element Classification | Metal |
| Group Name | Alkaline Earth Metal |
| Group number (Periodic table) | 2 |
| Period Number (Periodic table) | 4 |
| Atomic number | 20 |
| Atomic weight | 40.078 (Ref: Jlab-ele020, Ciaaw-calcium, Nist-20) 40.08 (Ref: Lanl-20) |
| Atomic Radius | 231 pm (Van der Waals) (Ref: Lanl-20) |
| Density | 1.54 g/cm3 (Ref: Jlab-ele020) |
| Melting point | 842°C (Ref: Jlab-ele020, Lanl-20) |
| Boiling point | 1484°C (Ref: Jlab-ele020, Lanl-20) |
| Electron shell configuration | 1s2 2s2 2p6 3s2 3p6 4s2 |
| Oxidation States | +2 (Ref: Jlab-ele020) +2, +1 (a strongly basic oxide) (Ref: Lanl-20) |
| Ionization Energy | 6.113 eV (Ref: Jlab-ele020)6.11315547 eV (Ref: Nist-20) |
| Number of Stable Isotopes | 3 |
| InChI | 1S/Ca (Ref: Pubchem-20) |
| InChI Key | OYPRJOBELJOOCE-UHFFFAOYSA-N (Ref: Pubchem-20) |
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