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I originally e-mailed these suggestions in to dndinsider@wizards.com but as there's now a thread...

9 - Fluorine Dragons - Fluorine dragons are the most temperamental and violent dragons in existence - they freely attack anything without a moment's hesitation inflicting masses of damage even upon the strongest of opponents. They are absolutely fearless and virtually impossible to contain or control! (Fluorine is the most violently reactive element on the earth and it attacks and aggressively reacts with practically everything. It is severely corrosive, causes terrible burns and also happens to be extremely poisonous. It is extremely difficult to store and eats it's way through the toughest of glass with little difficulty. Fluorine even causes notoriously fire resistant materials like asbestos to burst into flames).
 
15 - Phosphorus Dragons - Phosphorus Dragons make their homes in the deepest layers of the Nine Hells - they are often found in caves near the summits of active volcanoes. At birth, Phosphorus Dragons have white scales which turn deep red as they grow, with ancient Phosphorus Dragons having hard, shiny black scales. They are very temperamental and have extremely fearsome breath weapons which cause all flammable material, even metal, to burst instantly into flames! (Phosphorus is another extremely reactive element with three common allotropes - White, Red and Black. The simplest hydride of Phosphorus - Phosphine - is a very toxic and pyrophoric gas).

35 - Bromine Dragon - Bromine Dragons live in caves near to the sea and have one of the most fearsome breath weapons - they expel a cloud of deep red corrosive, poisonous gas which if you survive the effects of the poison, leaves you with severe burns effectively removing you from combat for several rounds. (Bromine is obtained primarily from sea water and is both highly corrosive as well as being poisonous).

71 - Lutetium Dragon - Lutetium Dragons wander from place to place with no discernible purpose - it has been suggested that they take delight in being studied by others who seek to understand their true nature. (Lutetium is an element with no known practical applications - it is seen to be of research interest only).

76 - Osmium Dragon - Osmium Dragons are exceedingly rare and can only be found in and around collapsed stars or pockets of void deep within the Astral Sea. Their super hard scales are a lustrous silver colour with a distinctive bluish sheen. Their breath weapon is a gas which reacts with the air to produce dreadful fumes which cause blindness. (Osmium is the densest element and a silvery blue colour, Osmium Tetroxide is a very dangerous compound, the vapour from which can cause permanent blindness simply by coming into contact with the eyes).

85 - Astatine Dragon - Astatine Dragons are rumored to have only ever been seen for the briefest of seconds before disappearing into nothingness leaving death in their wake - no one who has ever caught a glimpse of one has survived long enough to give an accurate description. (Astatine is the rarest element known with roughly 25g present on the whole of earth at any one time. It has a very short half life and if I can steal a phrase from the fabulous Theodore Gray - 'if you had a visible amount of it, you would be dead and it would have vanished before your body was even cold').