Best Answer: In the most common form of atomic bomb uranium 235 is split by striking it with a low energy neutron. Generally the heavier an element the easier it is to split its atom (fission).
Grainger's headquarters is located in Lake Forest, Illinois.
History of Grainger County. The First settlement of Grainger County began about 1785, along the Clinch Mountain valley, at the head of Flat Creek. The first settlers were some who had resided originally in what is still Hawkins County.