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.
By Lydia Smith. The aftermath of the atom bomb dropped on Hiroshima, Japan, by the Americans at the end of World War II Getty. On 6 August 1945, an American B-29 bomber dropped the world's first deployed atomic bomb over the southern Japanese city of Hiroshima.The explosion immediately wiped out around 90% of the city and killed around 80,000 people.hree days later, a second B-29 dropped another A-bomb on Nagasaki, killing an estimated 40,000 people. One minute after. At 8.15am Japan time, US bomber Enola Gay released the nuclear bomb 'Little Boy' above central Hiroshima.