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.
Allied casualties during the 2nd Battle of the Marne were heavy: French (95,000), British (13,000) and United States (12,000). It is estimated that the German Army suffered an estimated 168,000 casualties and and marked the last real attempt by the Central Powers to win the First World War.