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.
With the failure of the German offensive against France at the Battle of the Marne, and the allied counter-offensive, the so-called ' race to the sea ' began, a movement towards the North Sea coast as each army attempted to out-flank the other by moving progressively north and west.