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.
Their protests were ignored. Hiroshima and Nagasaki: 1945. The atomic bomb dropped was dropped on Hiroshima on August 6, 1945. The bomb was called Little Boy and it was released by the Enola Gay.It was dropped at 8:15 AM and hit the ground with tremendous force. The history of the atomic bomb shows 66,000 were killed at that moment. Over 70,000 were injured.t was tasked to create the bomb beginning in 1939. The scientists who invented the bomb included Robert Oppenheimer, Edward Teller, Rudolf Peierls and many others. The Origin of the Manhattan Project. Its roots lay in a letter Albert Einstein sent to President Franklin Roosevelt.