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.
First Battle of the Marne. At the end of August 1914, the three armies of the German invasion's northern wing were sweeping south towards Paris. The French 5th and 6th Armies and the British Expeditionary Force (BEF) were in retreat. General Alexander von Kluck, commander of the German Ist Army, was ordered to encircle Paris from the east.