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.
Battle of Dunkirk - Conflict: The Battle and evacuation of Dunkirk occurred during World War II. Battle of Dunkirk - Dates: Lord Gort made the decision to evacuate on May 25, 1940, and the last troops departed France on June 4.