Metalloids are metallic-looking brittle solids that are either semiconductors or exist in semiconducting forms, and have amphoteric or weakly acidic oxides. Typical nonmetals have a dull, coloured or colourless appearance; are brittle when solid; are poor conductors of heat and electricity; and have acidic oxides.
(1860-1948).At the age of 56, John J. Pershing became the commander of the American Expeditionary Force that helped to turn the tide in favor of the Allies and against the Central Powers during World War I. For his leadership during the war, he was promoted to the rank of general of the armies.
This was a first victory of the First United States Army in the first entirely U.S. operation. Pershingâs staff consisted of such future leaders of World War II as Maj. Douglas MacArthur; Col. George C. Marshall; sharpshooter and Medal of Honor recipient from Tennessee, Pvt. Alvin York; Maj. Eddie Rickenbaker; Brig.