Calcium

 Whispers - 1/31/2005 1:52:40 AM

help me wut is interesting info on iron an what is important usses of it beside made to create building an sewer pipes an who found it thanks help me out please

 Corey - 1/30/2005 8:39:18 PM

what are the uses of calcium?
What are the chemical properties of calcium?

 Chris - 1/28/2005 1:36:18 AM

	Lulu - 1/23/2005 7:52:27 AM
	Hey wuz up they discover calcium in 1808 and who discovered it was someone tell me that because i need to know it plzz. u can e-mail me if u have any info at houstxlulu@aol.com

yeas calcium was discovered by Sir Humphry Davey bro. this might be a little late and you might already have the information but hey i tried any stuff you have on it please let me know

 chase - 1/26/2005 3:53:55 AM

when was calcium discovered?

 BeCcA RoD. - 1/25/2005 1:44:13 AM

	tar - 11/8/2004 3:01:17 AM
	how many valence electrons does calcium have

hey need to find out how many valence electrns calcium has

 amie s - 1/23/2005 8:53:18 PM

hope that answers a lot of ur questions every1!

 amie s - 1/23/2005 8:41:13 PM

Symbol:Ca
Group #:2 (II A)
Group Name:Alkaline Earth Metals
Atomic #:20
Mass #:40.08
Atomic Mass:40.078
Electron Configuration:1s22s22p63s23p64s2

Physical Properties:
Bpt:1484 °C (2,703 °F)
Mpt:839 °C (1,542 °F)
Density:1.55g/ml (1.55g per cubic centimeter at 20 °C)( at 20 °C/293K)
Radioactivity:None
Color:Silverish-white
Odor:Metallic odor
Hardness:Fairly hard
Brittle:None
Malleability:Medium

Chemical Properties: (Click here for Demonstrations!! )
Calcium forms a white coatingof nitride in the air. Calcium, like all other alkaline earth metals reacts moderately in water. When calcium reacts with water it forms calcium oxide. Calcium reacts highly in acid. Also, when calcium is burned it burns with a yellow-red flame, forming largely the nitride. Calcium reacts readily with oxygen. When calcium is expposed to moist air the surface becomes coated with calcium hydroxide, carbonate, and oxide.

History:
Calcium was discoverd by Sir Humphry Davy. Calcium was firts found purely in 1808. But Ancient Greeks, Romans, and Egyptians knew about calcium compounds and used it to make mortar. Calcium occurs naturally in limestone, gypsum, and flourite. The element calcium is found in bones, teeth, eggshells, and in the shells of creatures like oysters and clams.Osteoporosis is a disease in which the bones are deprived of calcium. Normal bones consist of a series of thin, intersecting plates. These plates are surrounded by a dense shell. In osteoporosis, the plates are filled with holes, or they dissappear. Osteoporosis takes years to develop, there are no warning signs of this disease. Osteoporosis can result from other diseases such as local injury or inflammation, hormonal diseases, and lack of physical activity, as well as natuarl loss of bones that occurs as a person gets older.

Uses:
Their are many uses for the element calcium. Calcium is the 5th most common element of all the elements in the earth's crust. Calcium is made up of about 3.4% of the earth's crust. Some uses of calcium are fertilizers, calcium is used to make metallergic and electronic materials. Calcium is also used as a deoxidizer in the refining of steel, iron, copper, and alloys of copper. It is also used for extracting certain metals from their ores. Calcium hydroxide is used in the process of making lime. It is also used in making antacids that buffer the pH of the soil in gardening.

 Lulu - 1/23/2005 7:52:27 AM

Hey wuz up they discover calcium in 1808 and who discovered it was someone tell me that because i need to know it plzz. u can e-mail me if u have any info at houstxlulu@aol.com

 Josh - 1/22/2005 8:26:32 PM

How was calcium discovered?

 hayley - 1/22/2005 12:20:28 PM

i am doing a project and i need to know how many neutrons calcium contains
please help me

 Stephanie Wolf - 1/19/2005 1:36:25 AM

	Nathan - 12/11/2004 9:03:42 PM
	it has shoobidaba electrons

it has 20 electron 20 neutrons and 20 protons~ thats a fact :)

 Stephanie Wolf - 1/19/2005 1:31:38 AM

I am doing a project of calcium and i need to know who discovered it, when, and how they did it. other then that i know alot about calcuim so if you ever need any help lemme know

maria - 1/17/2005 7:38:49 PM

i have a project due tomorrow on calcium and im almost finished but i need 3 interesting facts. please help

 Charlene - 1/17/2005 2:52:15 AM

squirrels need calcium in their diet! it keeps theri teeh healthy, if they do not have teeth strong enough to bite into acorns and nuts they can starve!

 angelica arroyo - 1/14/2005 12:49:00 AM

can you please help me look for the elements of carben i have to do a report on the elements of carben and i cant find the email addresse thank you very much

 Jamie - 1/12/2005 7:47:59 PM

The boiling point of calcium is 1484 C
The melting point of calcium is 839.2 C
Number of electrons: 20
Number of isotopes: 14
Number of protons: 20
Discovered by Sir Humphrey
Forms more than 3% of the earth’s crust.
Can be found in leaves, bones, teeth, and shells
Calcium is a metal, which is kind of hard
Calcium reacts with water
It burns with a yellow-red flame

 randy - 1/10/2005 4:41:58 PM

i have a project due on the 20th of this month. and got to to a project of ABC of elements, and i got calcium, ABC of elements is when you pick a element and you write information about it with every letter in the alphabet like each letter one paragraph about calcium. i would very highly appriciate ur help. thank you

 Lizzy - 1/9/2005 6:30:09 PM

i have a report due friday. what are some interesting facts about calcium and what are the common uses for calcium andthe state that the element exits in within a pure state

 Lizzy - 1/9/2005 6:23:03 PM

the atomic mass is 40.08

 Courtney - 1/9/2005 3:15:26 PM

Was descoverd in 1808,found by a dude named Sir humphrey davy .uses for it are making lime, bricks,, glass, paint, paper, sugar, glazes, plus more.