logo

Video encyclopedia

Calcium

3:24

Pregnant women को गर्भावस्था में कितना % CALCIUM ,IRON, FOLIC ACID , PROTEIN लेनी चाहिए और क्यों ?

3:16

Calcium & Iron For A Healthy Diet during Pregnancy | Gynaecology and Obstetrics - Episode 6

1:10

#14 - Why we need Calcium for our Bones - #ElementADayInMay

2:26

Five quick tips to ease period pain

2:25

Calcium Deficiency Symptoms, लक्षण जो बताते है कैल्शियम की कमी | Boldsky

Calcium is a chemical element with symbol Ca and atomic number 20. An alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. It is the fifth most abundant element in Earth's crust and the third most abundant metal, after iron and aluminium. The most common calcium compound on Earth is calcium carbonate, found in limestone and the fossilised remnants of early sea life; gypsum, anhydrite, fluorite, and apatite are also sources of calcium. The name derives from Latin calx "lime", which was obtained from heating limestone.
  • Types 

  • Characteristics 

  • History 

  • Occurrence and production 

  • Uses 

  • Food sources 

  • Biological and pathological role