spontaneous transition
21radioactivity — /ray dee oh ak tiv i tee/, n. Physics, Chem. the phenomenon, exhibited by and being a property of certain elements, of spontaneously emitting radiation resulting from changes in the nuclei of atoms of the element. Also called activity. [1895… …
22Population inversion — In physics, specifically statistical mechanics, a population inversion occurs when a system (such as a group of atoms or molecules) exists in state with more members in an excited state than in lower energy states. The concept is of fundamental… …
23Dubnium — rutherfordium ← dubnium → seaborgium Ta ↑ Db ↓ (Upp) …
24Ferroelectricity — is a property of certain materials which possess a spontaneous electric polarization that can be reversed by the application of an external electric field.[1][2] The term is used in analogy to ferromagnetism, in which a material exhibits a… …
25Hypnagogia — (Greek ὕπνος, húpnos sleep + the root found in ἄγω, ágō to lead away, conduct, convey , ἀγωγεύς, agōgeús conveyor , ἀγωγή, agōgḗ abduction, transport, leading away etc.), often misspelled hypnogogia , is a term coined by Alfred Maury for the… …
26Darmstadtium — meitnerium ← darmstadtium → roentgenium Pt ↑ Ds ↓ (Uhn) …
27Ununoctium — ununseptium ← ununoctium → ununennium Rn ↑ Uuo ↓ (Uho) …
28Christianity — /kris chee an i tee/, n., pl. Christianities. 1. the Christian religion, including the Catholic, Protestant, and Eastern Orthodox churches. 2. Christian beliefs or practices; Christian quality or character: Christianity mixed with pagan elements; …
29Actinide — The atomic bomb dropped on Nagasaki had a plutonium charge.[1] The actinide or actinoid (IUPAC nomenclature) series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium thro …
30Mendelevium — fermium ← mendelevium → nobelium Tm ↑ Md ↓ (Upu) …
