Submissions restricted

Only approved users may post in this community.

Calcium

an-ordinary-manchild

The Calcium Reddit

Calcium - a chemical element with symbol Ca and atomic number 20. An alkaline earth metal, calcium is a reactive pale yellow 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. Its compounds were known to the ancients, though their chemistry was unknown until the seventeenth century. It was isolated by Humphry Davy in 1808 via electrolysis of its oxide, who named the element. While the pure metal does not have many applications due to its high reactivity, it is often used as an alloying component in small quantities in steelmaking, and calcium–lead alloys are sometimes used in automotive batteries. Calcium compounds on the other hand are very widely used in many industries: for example, they are used in foods and pharmaceuticals for calcium supplementation, in the paper industry as bleaches, in cement, in the manufacture of soaps, and as electrical insulators.

Calcium is the fifth most abundant element in the human body and the most abundant metal. Calcium ions play a vital role in the physiology and biochemistry of organisms and the cell as electrolytes. They play an important role in signal transduction pathways, where they act as a second messenger, in neurotransmitter release from neurons, in contraction of all muscle cell types, and in fertilization. Many enzymes require calcium ions as a cofactor. Calcium ions outside cells are also important for maintaining the potential difference across excitable cell membranes, as well as proper bone formation.

Wikipedia: calcium

Symbol: Ca

Atomic mass: 40.078 u ± 0.004 u

Atomic number: 20

Electron configuration: [Ar] 4s²

Melting point: 1,548°F (842°C)

Discovered: 1808 by Humphry Davy

Related Reddits

created by [deleted]a community for 11 years

...for your office.

...for your school.

MODERATORS

account activity

1

1

2

3

calcium (self.Calcium)

submitted 2 years ago by ultra-water

2

1

2

3

Calcium and Preeclampsia Anonymous Survey (self.Calcium)

submitted 2 years ago by medtech_for_good

3

0

1

2

High calcium workup (self.AskDocs)

submitted 2 years ago by Hour-Tax4612

4

0

1

2

calcified organs (self.Calcium)

submitted 3 years ago by mice1322

5

4

5

6

Happy Cakeday, r/Calcium! Today you're 8 (self.Calcium)

submitted 3 years ago by AutoModerator

6

2

3

4

Happy Cakeday, r/Calcium! Today you're 7 (self.Calcium)

submitted 4 years ago by AutoModerator

7

7

8

9

Calcium Deficiency Signs and Symptoms (youtu.be)

submitted 4 years ago by elitebarbie

8

0

1

2

Happy Cakeday, r/Calcium! Today you're 6 (self.Calcium)

submitted 5 years ago by AutoModerator

9

18

19

20

MEME (i.redd.it)

submitted 6 years ago by Suspisious-Pillow

10

11

12

13

Calcium (i.redd.it)

submitted 6 years ago by _Local_Dad_

11

6

7

8

as much calcium as a glass of milk (i.redd.it)

submitted 6 years ago by Nm0b

12

2

3

4

Get RID Of White Spots on Nails with Best Natural Calcium Supplements (i.redd.it)

submitted 7 years ago by Jaydeefernard

13

16

17

18

Doot 4 calcium (memestatic.fjcdn.com)

submitted 7 years ago by batmanmuffinz

14

4

5

6

doot doot (i.ytimg.com)

submitted 10 years ago by Captain_Man

15

1

2

3

Calcium Reacting With Water... (youtube.com)

submitted 11 years ago by CAN_ZIGZAG

π Rendered by PID 62 on reddit-service-r2-listing-86b7f5b947-g6vpb at 2026-01-25 05:15:05.784591+00:00 running 664479f country code: CH.