Calcium

Properties
Atomic symbol |  Ca
Atomic number |  20
Classification |  Alkaline Earth
Atomic mass |  40.1 amu
Number of Stable Isotopes |  6
Density (grams per cc) |  1.55 g/cm^3
Other Information
Date of discovery |  1808
Name of discoverer |  Sir Humphrey Davy
Name origin |  From the Latin calx (limestone)
Uses |  Calcium is one of the primary elements in bones, shells, etc. Taking calcium internally can promote bone growth.
Obtained from |  Chalk, limestone, marble.

Calcium is a very important element to human physiology, as calcium-phosphate salts form the basis for the creation of bones. It is also a critical cellular component in all organisms, and in animals serves roles of particular importance in blood, the cardiovascular system, and the nervous system. Consuming too much calcium can lead to kidney stones, which are typically composed of calcium deposits.

Calcium in its pure form is referred to as "the white element" and must be kept isolated from air.

Periodic Table of the Elements

1  | 2  | 3  | 4  | 5  | 6  | 7  | 8  | 9  | 10  | 11  | 12  | 13  | 14  | 15  | 16  | 17  | 18

1.008

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

4.003

6.939

9.0122

|  |  |  |  |  |  |  |  |  |  |

10.811

12.011

14.007

15.999

18.998

10.183

22.99

24.312

|  |  |  |  |  |  |  |  |  |  |

26.982

28.086

30.974

32.064

35.453

39.948

39.102

40.08

44.956

47.9

50.942

51.996

54.938

55.847

58.933

58.71

63.546

65.37

69.72

72.59

74.922

78.96

79.904

83.8

85.47

87.62

88.905

91.22

92.906

95.94

[97]

101.07

102.91

106.4

107.87

112.4

114.82

118.69

121.75

127.6

126.9

131.3

132.91

137.34

57*

138.91

178.49

180.95

183.85

186.2

190.2

192.2

195.09

196.97

200.59

204.37

207.19

208.98

210

210

222

215

226.03

89**

227.03

104

[261]

105

[262]

106

[266]

107

[264]

108

[265]

109

[268]

110

[271]

111

[272]

112

[277]

113

[284]

114

[289]

115

[288]

116

[292]

117

[293]

118

[294]

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
*Lanthanides  |

140.12

140.91

144.24

145

150.35

151.96

157.25

158.92

162.5

164.93

167.26

168.93

173.04

174.97

|  |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
**Actinides  |

232.04

231

238.03

237.05

239.05

241.06

244.06

249.08

252.08

252.08

100

257.1

101

258.1

102

259.1

103

262.11

|  |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |