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.
Mark Wayne Clark was a United States Army officer who saw service during World War I, World War II, and the Korean War. He was the youngest four-star general in the United States Army during World War II. During World War I, he was a company commander and served in France in 1918, as a 22-year old captain, where he was seriously wounded by shrapnel. After the war, the future U.S. Army Chief of Staff, General George Marshall, noticed Clarkâs abilities. During World War II, he commanded the ...