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.
The atomic bomb was dropped on Hiroshima, Japan on August 6, 1945 and on Nagasaki, Japan three days later on August 9, 1945. These bombings effectively brought an end to World â¦ War II.n August 9, 1945, a second bomb was dropped on Nagasaki, Japan. An estimated 1/4 million people were killed by the two blasts. No official warning was given to the Japanese Government prior to the bombings, but there were several Pamphlet runs by American planes.