Actinium

Statistics:

• Name: Actinium
• Symbol: Ac
• Classification: Actinides
• Atomic Number: 89
• Atomic Mass: 227.0278 g/mol
• Density: 10.07 g/cm³
• Melting: 1047°C
• Boiling: 3197°C
• Protons & Electrons:89
• Neutrons:138
• Discovered: 1899
• Discovered By: Debierne
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Electrons Per Energy Level:

• Level 1: 2
• Level 2: 8
• Level 3: 18
• Level 4: 32
• Level 5: 18
• Level 6: 9
• Level 7: 2

Isotopes:

Isotope: Half-life

• ²²⁵Ac: 10.0 days
• ²²⁶Ac: 29.37 hours
• ²²⁷Ac: 21.773 years
• ²²⁸Ac: 6.15 hours

Brief Summary

Actinium is a Actinides with the symbol 'Ac' and contains 89 Protons & Electrons with 138 neutrons in the nucleus of the atom. Actinium has an atomic mass of 227.0278 g/mol and, at a temperature of 20°C, has a density of 10.07 g/cm³. It will melt at a temperature of 1047°C and boil at 3197°C.

Actinium was discovered by Debierne in 1899 and is named 'Actinium' Greek word "aktinos" meaning "ray".

Some common usages for Actinium: currently unknown.

Definitions and Notes

Density listed is at a temperature of 20°C.

Isotopes are forms of an element who have the same atomic number but different mass because they contain different number of neutrons.

Half-life is the time required for a quantity of a subject to fall to half of its current quantity.

MLA Citing Format

Actinium :: Ac :: 89 - Chemical Element. 29 Jul. 2010 <http://www.chemicalelement.com/element/actinium.html>.