The term STUDY BOHR is a reference to the Danish physicist Niels Bohr, who made significant contributions to the understanding of atomic structure and quantum mechanics. The crossword solutions for the term are ATOM, which is a fundamental building block of matter. An ATOM consists of a nucleus, which contains protons and neutrons, surrounded by electrons in shells. Bohr's model of the ATOM proposed that electrons orbit the nucleus in distinct energy levels. His work helped to explain the structure of atoms and the behavior of light.