Chemical properties. Calcium is a moderately active element. It reacts readily with oxygen to form calcium oxide (CaO): Calcium reacts with the halogensâ fluorine, chlorine, bromine, iodine, and astatine, The halogens are the elements that make up Group 17 (VIIA) of the periodic table.
The bombing of Hiroshima and Nagasaki. On August 6, 1945 the US dropped an atomic bomb (Little Boy) on Hiroshima in Japan. Three days later a second atomic bomb (Fat Man) was dropped on the city of Nagasaki.These were the only times nuclear weapons have been used in war.Reasons for the bombing.Many reasons are given as to why the US administration decided to drop the atomic bomb on Hiroshima and Nagasaki. Reasons include the following: 1  The United States wanted to force Japan's surrender as quickly as possible to minimize American casualties.hese were the only times nuclear weapons have been used in war. Reasons for the bombing. Many reasons are given as to why the US administration decided to drop the atomic bomb on Hiroshima and Nagasaki.
1 The US dropped the Atom Bomb on Hiroshima after the sneak attack on Pearl Harbor during WWII. 2  It was the first Atom Bomb to ever be used, and was not the last. 3  The second Atom Bomb was dropped on Nagasaki which was the final straw in ending WWII this day is called V-J Day (Victory over Japan Day).apan attacked the US Army and Navy bases on Pearl Harbor, Hawaii on December 7, 1941, starting a four year war in the Pacific. To end the war quickly President Harry S Truman â¦ approved dropping the two atomic bombs, code-named Little Boy and Fat Man on Hiroshima and Nagasaki, Japan.