اطلاعات پایه ای در مورد اکتینیدها

Name: Actinium
Symbol: Ac
Atomic Number: 89
Atomic Mass: (227.0) amu
Melting Point: 1050.0 °C (1323.15 K, 1922.0 °F)
Boiling Point: 3200.0 °C (3473.15 K, 5792.0 °F)
Number of Protons/Electrons: 89
Number of Neutrons: 138
Classification: Rare Earth
Crystal Structure: Cubic
Density @ 293 K: 10.07 g/cm³
Color: Silvery

 

 

Atomic Structure

Number of Energy Levels: 7   First Energy Level: 2 Second Energy Level: 8 Third Energy Level: 18 Fourth Energy Level: 32 Fifth Energy Level: 18 Sixth Energy Level: 9 Seventh Energy Level: 2

 

Isotopes

Isotope	Half Life
Ac-225	10.0 days
Ac-226	1.2 days
Ac-227	21.8 years
Ac-228	6.16 hours

 

Facts

Date of Discovery: 1899
Discoverer: Andre Debierne
Name Origin: From the Greek word aktinos (ray)
Uses: No uses known
Obtained From: extremely rare

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