Elements in the periodic table are grouped as metals, metalloids or semimetals, and nonmetals. The metalloids separate the metals and nonmetals on a periodic table. Also, many periodic table have a stair-step line on the table identifying the element groups.
Quick Facts. Background. The Second Battle of the Marne marked the turning of the tide in World War I. It began with the last German offensive of the conflict and was quickly followed by the first allied offensive victory of 1918.
A battle of attrition. The Battle of the Somme, fought in northern France, was one of the bloodiest of World War One. For five months the British and French armies fought the Germans in a brutal battle of attrition on a 15-mile front. The aims of the battle were to relieve the French Army fighting at Verdun and to weaken the German Army.