the second group, called the alkaline earth metals, are part of Beryllium, magnesium, calcium, strontium and barium. These elements have two valence electrons in divalent as hydrides are obtained as BeH2, MgH2, and oxides such as MgO, CaO, ... They are all soft metals, malleable, very light and good conductors of heat,
with very different properties and reactivity . Beryllium is very hard, has a relatively high melting point, and gives rise to highly toxic compounds. Even the metal, reduced to dust, it is toxic. It 'also the least reactive of the group. Magnesium is known to all, and is the industrial metal lighter. Football, as everyone knows, is a component of bones and is present in the plaster, as well as a myriad of other compounds. Elementary state is very reactive, as it is preserved under liquid paraffin. Strontium and barium are heavier than the previous ones, are also more responsive and less known. They react readily with water creating hydrogen.
Other material on the reactivity elements of the second group: http://www.tavolaperiodica.it/reattivita_metalli_alcalino_terrosi.html
0 comments:
Post a Comment