Final answer:
The first nuclear bomb was tested on July 16, 1945, in New Mexico. It was not placed on the ground but on a steel tower. Scientists were concerned it might ignite the atmosphere.
Step-by-step explanation:
The question you're asking is not directly related to the Telephone Bomb Threat Checklist. However, I can provide information on a different but related topic: the first nuclear bomb test, which is part of the subject of Social Studies.
Background on First Nuclear Bomb Test
The first nuclear bomb was tested on July 16, 1945, as part of the Manhattan Project, at the Trinity site near Alamogordo, New Mexico. This first detonation of a nuclear weapon was code-named "Trinity." As for the placement, the bomb was not placed on the ground; instead, it was hoisted atop a steel tower to simulate an airburst. Moreover, scientists had a major concern about the first nuclear bomb test; they were afraid that it might ignite the atmosphere, which could lead to catastrophic consequences.