hydrogen is the element in group 1 that is not an alkaline metal.
hydrogen is the element in group 1 that is not an alkaline metal.
which element in group 1 is not an alkaline metal?
hydrogen
caesium hydride









































caesium hydride or cesium hydride (csh) is a compound of caesium and hydrogen. it is an alkali metal hydride.









































it was the first substance to be created by light-induced particle formation in metal vapor, and showed promise in early studies of an ion propulsion system using caesium. it is the most reactive stable alkaline metal hydride of all. it reacts with water extremely vigorously.
caesium hydride
are created through contact ionization of atoms of alkali metals 









































that have low ionisation potentials. the hot plate is made of a 









































metal that has a large work function and can withstand high 









































temperatures, e.g. tungsten or rhenium. the alkali metal is 









































boiled in an oven that is designed to direct a beam of alkaline 









































metal vapour onto the hot plate. a high value of the hot plate 









































work function and a low ionisation potential of the metal makes 









































for a low potential barrier for an electron in the alkaline metal
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