Definition of atom. 1  1a : the smallest particle of an element that can exist either alone or in combination an atom of hydrogenb : the atom considered as a source of vast potential constructive or destructive energy â¦ a largely forgotten legacy of this country's conquest of the atom.
The mountain, a part of the Cascade Range, is a volcano that has not erupted for 2,000 years. It is also the highest mountain in the state of Washington. English explorer George Vancouver named Mount Rainier in honor of another navigator, Peter Rainier. Some people, however, prefer to call the mountain by its Indian name, Mount Tacoma.
History of Mount Everest How did Mount Everest get its name? Mount Everest got its name from a man named George Everest. George was a British surveyor general who led an expidition to map the Himalayas. Before that, the mountain was known as Peak 15. After the expidition, the mountain was named Mount Everest in his name.