Chemical Elements.com - Calcium (Ca)

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Basic Information

Name: Calcium
Symbol: Ca
Atomic Number: 20
Atomic Mass: 40.078 amu
Melting Point: 839.0 °C (1112.15 K, 1542.2 °F)
Boiling Point: 1484.0 °C (1757.15 K, 2703.2 °F)
Number of Protons/Electrons: 20
Number of Neutrons: 20
Classification: Alkaline Earth
Crystal Structure: Cubic
Density @ 293 K: 1.55 g/cm³
Color: Silvery

Atomic Structure

Number of Energy Levels: 4

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Isotopes

Isotope	Half Life
Ca-40	Stable
Ca-41	103000.0 years
Ca-42	Stable
Ca-43	Stable
Ca-44	Stable
Ca-45	162.7 days
Ca-46	Stable
Ca-47	4.5 days
Ca-48	Stable
Ca-49	8.7 minutes

Facts

Date of Discovery: 1808
Discoverer: Sir Humphrey Davy
Name Origin: From the latin word calcis (lime)
Uses: life forms for bones and shells
Obtained From: chalk, limestone, marble. 3.5% of crust

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