Atomic Number of Calcium

Calcium Atomic Number

Atomic Number of Calcium is 20.

Chemical symbol for Calcium is Ca. Number of protons in Calcium is 20. Atomic weight of Calcium is 40.078 u or g/mol. Melting point of Calcium is 839 °C and its the boiling point is 1487 °C.

» Boiling Point » Melting Point » Abundant » State at STP » Discovery Year

About Calcium

One of the most important elements for humans and animals, calcium is a light and soft metal of light grey color. It is very reactive, especially with water and air. It has got its name from a Latin word meaning lime. It is impossible to find pure calcium in nature, but it can be found in abundance in various chemical compounds, thus it is considered to be the fifth most abundant element on the surface of earth. We receive calcium with foods and when brushing our teeth. In a human body, we have about 1 kilogram of calcium which is mainly in our bones and teeth. Calcium is used in metallurgy to produce alloys with other metals, as well as in chemical industry or for producing various goods like paper, food, products from clay, and others. Calcium and especially a few of its compounds are very toxic.

Uses of Calcium

Calcium, a silvery-white, alkaline earth metal with the symbol Ca, is mostly used in steelmaking. Calcium compounds are commonly used in foods, paints, toothpaste, rubbers, papermaking, baking, and medicine. They are used as pharmaceuticals as well as for laboratory purposes too. Calcium carbonate is mainly used in the construction industry. It is also preferred in the oil industry, and it can be added to swimming pools.

Calcium metal is used as an alloying agent for aluminum, copper, and magnesium. Tricalcium phosphate (abbreviated TCP) can be found in baby powders and toothpaste. Calcium fluoride, a compound with the elements calcium and fluorine, is used in the manufacture optical components like lenses, windows as well as telescopes, spectroscopy, etc. Calcium pyrophosphate, another compound with the formula Ca2P2O7, is widely used in toothpaste as a mild abrasive agent.

Compounds with Calcium

Properties of Calcium Element

Atomic Number (Z)20
Atomic SymbolCa
Atomic Weight40.078 u
Density1.54 g/cm3
Melting Point (K)1115 K
Melting Point (℃)839 °C
Boiling Point (K)1757 K
Boiling Point (℃)1487 °C
Heat Capacity0.647 J/g · K
Abundance41500 mg/kg
State at STPSolid
DescriptionAlkaline earth metal
Electronegativity (Pauling) χ1
Ionization Energy (eV)6.11316
Atomic Radius180pm
Covalent Radius174pm
Valence Electrons2
Year of Discovery1808

What is the Boiling Point of Calcium?

Calcium boiling point is 1487 °C. Boiling point of Calcium in Kelvin is 1757 K.

What is the Melting Point of Calcium?

Calcium melting point is 839 °C. Melting point of Calcium in Kelvin is 1115 K.

How Abundant is Calcium?

Abundant value of Calcium is 41500 mg/kg.

What is the State of Calcium at Standard Temperature and Pressure (STP)?

State of Calcium is Solid at standard temperature and pressure at 0℃ and one atmosphere pressure.

When was Calcium Discovered?

Calcium was discovered in 1808.