CHEM 2501 Lecture 4: Topic 4: Group 1: Hydrogen and the Alkali Metals
14 Jan 2016
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Topic 4: group 1: hydrogen and the alkali metals. Rarely forms h-(but does occasionally, see slide 16 and. Is not a metal (but it can be under extreme conditions (see beyond) slide 24) Hydrogen has unique properties that set it apart in the periodic table. Common oxidation states are 0 (h2), +1 (proton, acid/base chemistry) and -1 (hydride chemistry) It has two important isotopes: deuterium (d, 1 extra neutron) and tritium (t, 2 extra neutrons) Deuterium and oxygen forms heavy water, which can be isolated from regular water by electrolysis or fractional distillation. It has higher melting (3. 8 c) and boiling (101. 4 c) than water. Tritium is radioactive has a half-life of 12 years: You can separate heavy by fractional, distillation and hydrolysis. H+(called a proton) is never seen under ordinary conditions. In reality, the hydrated proton [h3o]+is the well known species in aqueous solution. Other crystalline acid hydrates contain ions suck as [h5o2]+and [h9o4]+
