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.
David By: David. General John J. Pershing. John Joseph Black Jack Pershing (September 13, 1860 â July 15, 1948) was an officer in the United States Army. Pershing eventually rose to the highest rank ever held in the United States military, equivalent only to the posthumous rank of George Washington: General of the Armies.