unstable
131un|sta|ble — «uhn STAY buhl», adjective. 1. not stable; not firmly fixed: a) easily moved or shaken; likely to break down: »an unstable mind. SYNONYM(S): unsettled. b) easily overthrown: »an unstable government. SYNONYM(S): unsettled. 2. not firm or solid;… …
132Atomic nucleus — A figurative depiction of the helium 4 atom with the electron cloud in shades of gray. In the nucleus, the two protons and two neutrons are depicted in red and blue. This depiction shows the particles as separate, whereas in an actual helium atom …
