Cesium
Caesium or cesium in the United States
Basic Info
- Atomic# is 55
- Atomic Mass of 133
- 55 protons
- 78 neutrons
- 55 balanced # electrons
- 40 known isotopes: these isotopes range from 112 to 151
- The most common and stable isotope is Cesium133
- Full electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s1
Physical Properties
- Silvery gold
- Alkali metal
- Soft metal
- Melting point at 28 degree Celsius
- ductile meaning to be drawn or pulled into thin wires
Chemical Properties
- Flammable in air at or below 55 degree Celsius
- Explosive with cold water
- Mildly toxic
- Reacts with ice at temperatures above -116 Degree Celsius
- Cesium metal when exposed with air can form dangerous super oxide on its surface
Pictures
Cesium Fluoride
Cesium has the lowest electronegativity of all non-radioactive elements and fluorine has the highest electronegativity of all elements. So burning Cesium with fluorine will make cesium fluoride. Cesium fluoride is an inorganic compound.
Fun Facts
- Classified as a hazardous material
- Used in Atomic clocks to be extremely accurate, every 1.4 million years the clock would be off by one second
- Obtained from pollucite and lepidolite
- Most electropositive of the elements
- From the Latin word "caesious" which means blue sky for its bright blue in its spectrum
- Two German chemists, Robert Bunsen and Gustav Kirchhoff, discovered cesium in 1860