Electron Configuration: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s1
Name |
Cesium |
Symbol |
Cs |
Atomic Number |
55 |
Atomic Mass |
132.90 amu |
Number of Protons |
55 |
Number of Electrons |
55 |
Number of Neutrons |
78 |
Melting Point |
28.5 degrees Celcius |
Boiling Point |
678.4 degrees Celcius |
Normal Phase |
Solid |
Family |
Alkali Metal |
Period |
6 |
Group |
1 |
Origin of Name |
From the Latin word, caesius, meaning sky blue for the blue lines in its spectrum |
Date & Place of Discovery |
Discovered by Robert Bunsen and Gustav Kirchoff in 1860 Germany |
Interesting Facts |
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Common Uses |
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