Metais alcalinos

http://www.youtube.com/watch?v=zdRO84lFpd0&eurl=http%3A%2F%2Fsites%2Egoogle%2Ecom%2Fsite%2Fpdfqfatimapires%2F&feature=player_embedded

http://www.youtube.com/watch?v=QH6WjbQs_2A&eurl=http%3A%2F%2Fsites%2Egoogle%2Ecom%2Fsite%2Fpdfqfatimapires%2F&feature=player_embedded