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.
World War I. First Battle of the Marne begins. On September 6, 1914, some 30 miles northeast of Paris, the French 6th Army under the command of General Michel-Joseph Manoury attacks the right flank of the German 1st Army, beginning the decisive First Battle of the Marne at the end of the first month of World War I.
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.