Boiling point alkaline earth metals

Neodymium, along with lanthanum, cerium and praseodymium, has low melting points and high boiling points. The fluorides of these and other rare earth metals are placed under highly purified helium or argon atmosphere in a platinum, tantalum or tungsten crucible in a furnace. They are heated under this inert atmosphere or under vacuum at 1000 to 1500°C with an alkali or alkaline earth metal. The halides are reduced to their metals ... 

Some of the halides of the alkaline earth metals have a similar identity problem. Calcium chloride and magnesium chloride have melting points almost as high as that of sodium chloride. Those compounds are clearly held together by ionic bonds. Beryllium chloride, on the other hand, melts at about half the temperature of table salt. And it boils at 520°C compared to salt s 1,465°C. The differences in properties are due to the partially covalent bond formed between beryllium and chlorine. 

The free alkaloid occurs as Icvorotatory. odorless, while, needle-like crystals pos es.sing a bitter taste. It is almost insoluble in water (1 5.000. 1 1.100 at the boiling point), etha (1 6,250). or chloroform (1 1.220). It is somewhat more soluble in ethyl alcohol (1 210. 1 98 at boiling point). (Note that in this chapter, a solubility of 1 5.000 indicates that I g is soluble in 5.000 mL of the solvent at 2S°C. Soliibilitieca other tcmperatuies are so indicated.) Because of the phenolic hydroxyl group, it is readily soluble in solutions of alkali a alkaline earth metal hydroxides. 

PYROPENTYLENE (542-92-7) Forms explosive mixture with air (flash point 26 F/—3°C). Unless inhibited, this substance may polymerize in moderate heat. Monomer converted (dimerized) to higher-boiling dicyclopentadiene at 32°F/0°C this conversion may be violent and exothermic. Reacts violently with strong oxidizers, strong acids, alkaline earth metals, dinitrogen tetroxide, magnesium, peroxides, potassium hydroxide, trichloroacetic... 

Most alkaline earth metals have higher melting points and boiling points than alkali metals. 

They have higher boiling points than the alkaline earth metals and lower boiling and melting points than the carbon group elements. 

Zn is an element of the subgroup of the alkaline earths, is like them in many respects, but the metal and its oxide have relatively low boiling points and the heat of combustion is low as well. Consequently, Zn as a component in pyrot systems does little in the way of enhancing the flame temp. On the contrary, it finds application then when low combustion temps and... 

Boiling point, °C 138 Melting point, C -78 Flash point, C 33 Auto-ignitlon temperature, ° C 300 Relative density (water -1) 0.8 Relative vapor density (air-1) 3.0 Relative density at 20 ° C of saturated mixture vapor/air(air-1) 1.01 Vapor pressure, mm Hg at 20 C 2.3 Solubility in water, g/100 ml 2.7 Explosive limits, vol% in air 1.3-10.5 Electrical conductivity, pS/m 2.6 x 10 Relative molecular mass 88.1 Log P octanol/water 1.3 Grossformula 5 12 COLORLESS LIQUID WITH CHARACTERISTIC ODOR Vapor mixes readily with air. Reacts violently with oxidants, with risk of fire and explosion. Reacts violently with alkaline-earth and alkali metals, giving off flammable gas (- hydrogen). ... 

---