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.
Mount Rainier National Park. Mount Rainier is a large volcanic peak located 85 miles (140 km) southeast of Seattle Washington. It rises to 14,410 feet (4,392 meters) and towers at least 8,000 feet (2,500 meters) above any of the surrounding mountains. On clear days, it dominates the southern horizon from Seattle and every surrounding community.