Images Dated 13th March 2009

Standard periodic table, element types

Standard periodic table, colour-coded for element types. The periodic table shows the chemical elements ordered by atomic number (number of protons in the nucleus), but arranged in rows (periods) so that elements with similar chemistry occur in the same vertical column (group). Here, blocks of elements with similar chemical properties are shown by the colours identified in the key at bottom. Each element is represented by its chemical symbol. Above each symbol is the element's atomic number, and below it is the element's name, as shown in the labelled example at lower right

© VICTOR HABBICK VISIONS/SCIENCE PHOTO LIBRARY

Heavy snowfall and reduced visibility over river Sosva

Heavy snowfall and reduced visibility over river Sosva. North Ural Mountains - Siberia - Russia. mainly coniferous boreal forest on its banks - open water is visible on shallows where the current is strong - largest deposits of snow towards the end of winter - mid - March

© Andrey Zvoznikov / ardea.com

Heavy, Historical, History, Reduced, River, Snowfall, Sosva, Visibility

Group portrait of five dogs sitting, from left to rt: two mongrels, Rough Collie

Group portrait of five dogs sitting, from left to rt: two mongrels, Rough Collie, Bobtail (Old English Sheepdog) and longhaired Chihuahua

© www.naturepl.com

Bobtail, Canis Familiaris, Catalogue2, Chihuahua, Collie Dog, Cutout, Dimorphism, Dogs, Domestic Animal, Five, Five Animals, Front View, Full Length, Group Of Animals, Groups, In A Row, Indoors, Large Dogs, Longhaired, Medium Dogs, Medium Group Of Animals, Miibreeds, Mongrel, Mongrel Dog, Mutt, Nobody, Old English Sheepdog, Pastoral Dogs, Pets, Portraits, Rough Collie, Shaggy, Sheepdog, Sitting, Size, Small Dogs, Studio, Studio Shot, Three, Toy Dogs, Vertebrates, White Background