Chapter 12 –Radioactivity
... • Most of the isotopes which occur naturally are
• A few naturally occurring isotopes and all of the
man-made isotopes are unstable.
• Unstable isotopes can become stable by
releasing different types of particles.
• This process is called radioactive decay and the
elements which undergo this ...
Calculating the Atomic Radius of Polonium
... College of St. Benedict|St. Johnʹs University
Three experimental facts are required to determine the atomic radius of a metallic element such as
polonium: density, molar mass and crystal structure.
The crystal structure of room temperature polonium is simple cubic, the only metallic element ...
Polonium is a chemical element with symbol Po and atomic number 84, discovered in 1898 by Marie Curie and Pierre Curie. A rare and highly radioactive element with no stable isotopes, polonium is chemically similar to bismuth and tellurium, and it occurs in uranium ores. Applications of polonium are few. They include heaters in space probes, antistatic devices, and sources of neutrons and alpha particles. Because of its position in the periodic table, polonium is sometimes classified as a metalloid. Other sources say that on the basis of its properties and behavior, it is ""unambiguously a metal"".