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55 protons 77 neutrons
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My Electrons55 electrons electron config: 2,8,18
The flame colours produced by cations and electronic transitions
Coloured flames are observed when these elements are heated. This is because their outer electrons can be excited to higher energy levels, when they absorb energy from the source of heat. The falling back of the electrons to the ground state causes the emission of light which for groups I and II happens to be in the visible region. The energy emitted is only of certain allowed quantities which correspond to certain electronic transitions.
The metal is characterised by a spectrum containing two bright lines in the blue (accounting for its name). It is silvery gold, soft, and ductile. It is the most electropositive and most alkaline element. Caesium, gallium, and mercury are the only three metals that are liquid at or around room temperature. Caesium reacts explosively with cold water, and reacts with ice at temperatures above -116°C. Caesium hydroxide is a strong base and attacks glass.
explodes in pure element form when it contacts with water.
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The values here are estimates adapted from references 1-6 by taking a consensus or averaging where appropriate. For ease of comparison with other abundance values, all abundance data in WebElements have been scaled to parts per billion (ppb), both as ppb by weight and by number of atoms. Values for less common elements should be treated with some caution and none of the data is better than one or sometimes two significant figures. Values for any individual human will depend very much upon that individual's local environment. For instance, if you live near a major road in a country where leaded fuel is still sold, you are likely to have more lead in you than the average.
These data are estimates of the average composition of the universe. Units are parts per billion by weight. Values in any one location may well vary widely from the values given here.
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HydridesThe term hydride is used to indicate compounds of the type MxHy and not necessarily to indicate that any compounds listed behave as hydrides chemically.
Caesium (cesium in USA) was discovered spectroscopically by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff in 1860 in samples of mineral water from Durkheim. Their identification was based upon two bright blue lines in the spectrum. The name caesium (from the Latin "caesius" - heavenly blue) was coined for its bright blue spectroscopic lines.
Caesium salts were isolated by Bunsen by precipitation from these spring waters - along with salts of other Group 1 elements. He was able to separate them and isolated the chloride and the carbonate. He was unable to isolate caesium metal, this wasachieved by Setterberg.
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