CHE K121 Lecture 19: L19C7,8
Document Summary
Periodic properties of the elements: group 1a, alkali metals react with h2 (g) to produce the metal hydride. Group 2 a (alkaline earth metals: form 2+ cation, (di-valent) except for be. Ionization and reactivity drop as you go down the table: be; mg (does not react with h20 at room temp) ca, sr, ba (all react with. Sr + 2h 2o sr (oh )2 + h2. Group 3a: boron - metalloid; all others in group are metals. Wednesday, november 7, 2018: aluminum is most abundant in compound for on earth. Group 4a: carbon - only non-metal (several allotropes - di erent structure forms); si and. Ge - metalloids; sn and pb - metals, both form 2+ and 4+ cations, but the 2+ is more common: e. g. " Pb(s) + hcl(aq) pbcl2(g) + h2(g: group 5a, n and p - non-metals; as and sb - metalloids; bi - metal.
