Actinium


 * Element name:** Actinuim


 * Element symbol:** Ac


 * Atomic mass:** 227[[image:actinium_najae.png width="216" height="288" align="right"]]


 * Atomic number**: 89


 * Protons:** 89


 * Electrons:** 89


 * Discovery:** Discovered by Andre Louis Debierne


 * How it was name:** from the greek word for a beam or ray


 * State of matter:** solid


 * Melting point:** 1050°C


 * Boiling point:** 3198°C


 * Characteristics:**
 * soft
 * silvery-white
 * radioactive


 * use of element:**
 * uses of actinium are impossible because it is radioactive and very rare

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 * interesting facts:**
 * actnium is a decay product of uranium
 * it has 21.6 year of life
 * its priciple decay