Atomic Number of Actinium

Actinium Atomic Number

Atomic Number of Actinium is 89.

Chemical symbol for Actinium is Ac. Number of protons in Actinium is 89. Atomic weight of Actinium is 227 u or g/mol. Melting point of Actinium is 1047 °C and its the boiling point is 3197 °C.

» Boiling Point » Melting Point » Abundant » State at STP » Discovery Year

About Actinium

Actinium is a chemical element discovered by a group of French scientists by extraction from uranium ores. The name of this chemical element comes from the Greek word meaning ray. It is a soft and very radioactive metal which gives beautiful light blue glow. This element is extremely toxic and is dangerous to all living organisms on our planet, and it is also one of the most powerful sources of alpha rays. It has no applications but scientific research. It can be found in its natural form on our planet, but only as a compound of uranium ores.

Properties of Actinium Element

Atomic Number (Z)89
Atomic SymbolAc
Atomic Weight227 u
Density10.07 g/cm3
Melting Point (K)1323 K
Melting Point (℃)1047 °C
Boiling Point (K)3471 K
Boiling Point (℃)3197 °C
Heat Capacity0.12 J/g · K
Abundance5.5×10−10 mg/kg
State at STPSolid
Electronegativity (Pauling) χ1.1
Ionization Energy (eV)5.17
Atomic Radius195pm
Covalent Radiusno datapm
Valence Electrons2
Year of Discovery1899

What is the Boiling Point of Actinium?

Actinium boiling point is 3197 °C. Boiling point of Actinium in Kelvin is 3471 K.

What is the Melting Point of Actinium?

Actinium melting point is 1047 °C. Melting point of Actinium in Kelvin is 1323 K.

How Abundant is Actinium?

Abundant value of Actinium is 5.5×10−10 mg/kg.

What is the State of Actinium at Standard Temperature and Pressure (STP)?

State of Actinium is Solid at standard temperature and pressure at 0℃ and one atmosphere pressure.

When was Actinium Discovered?

Actinium was discovered in 1899.