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Contributing structures of the carbonate ion. In chemistry, resonance, also called mesomerism, is a way of describing bonding in certain molecules or polyatomic ions by the combination of several contributing structures (or forms, [1] also variously known as resonance structures or canonical structures) into a resonance hybrid (or hybrid structure) in valence bond theory.
Clar's rule states that for a benzenoid polycyclic aromatic hydrocarbon (i.e. with only hexagonal rings), the resonance structure with the largest number of disjoint aromatic π-sextets is the most important to characterize its chemical and physical properties. Such resonance structure is called the Clar structure. In other words, a polycyclic ...
Clark Stanley's Snake Oil. Snake oil is a term used to describe deceptive marketing, health care fraud, or a scam.Similarly, snake oil salesman is a common label used to describe someone who sells, promotes, or is a general proponent of some valueless or fraudulent cure, remedy, or solution. [1]
However, resonance can also be detrimental, leading to excessive vibrations or even structural failure in some cases. [3] All systems, including molecular systems and particles, tend to vibrate at a natural frequency depending upon their structure; this frequency is known as a resonant frequency or resonance frequency.
Getafix's magic potion: Asterix: The magic potion the druid Getafix makes to give the villagers superhuman strength to fight the Romans. Lacasa: The Road to Oz "A sort of nectar famous in Oz and nicer to drink than soda-water or lemonade." Nectar and Ambrosia: Greek mythology: Before 424 BC
Thus, the lifetime of a particle is the direct inverse of the particle's resonance width. For example, the charged pion has the second-longest lifetime of any meson, at 2.6033 × 10 −8 s. [2] Therefore, its resonance width is very small, about 2.528 × 10 −8 eV or about 6.11 MHz. Pions are generally not considered as "resonances".
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The Bonn–Oberkassel dog was a Late Paleolithic (c. 12,000 BCE) dog whose partial skeletal remains were found buried alongside two humans in Bonn, Germany.Initially identified as a wolf upon its discovery in 1914, its remains were separated and lost within the University of Bonn's collections.