When this rule is broken, giving the " molecule " a charge, the result is sometimes named a molecular ion or a polyatomic ion.

When applied to the simplest two-electron molecule, H < sub > 2 </ sub >, valence bond theory, even at the simplest Heitler-London approach, gives a much closer approximation to the bond energy, and it provides a much more accurate representation of the behavior of the electrons as chemical bonds are formed and broken.

When cells enter mitosis, the sister chromatids ( which represent the two copies of each chromosomal DNA molecule resulting from DNA replication earlier in the cell cycle and packaged by histones and other proteins into chromatin ) are linked all along their length by the action of the cohesin complex.

When an electron in an excited molecule or atom descends to a lower energy level, it emits a photon of light equal to the energy difference.

When oxygen is not bound, a very weakly bonded water molecule fills the site, forming a distorted octahedron.

When red cells reach the end of their life due to aging or defects, they are broken down in spleen, the hemoglobin molecule is broken up and the iron gets recycled.

When trying to define rigorously whether an arrangement of atoms is " sufficiently stable " to be considered a molecule, IUPAC suggests that it " must correspond to a depression on the potential energy surface that is deep enough to confine at least one vibrational state ".

When proteins bind specifically to other copies of the same molecule, they can oligomerize to form fibrils ; this process occurs often in structural proteins that consist of globular monomers that self-associate to form rigid fibers.

When the functional group attacking the peptide bond is a thiol, hydroxyl or amine, the resulting molecule may be called a cyclol or, more specifically, a thiacyclol, an oxacyclol or an azacyclol, respectively.

When a chlorophyll molecule at the core of the photosystem II reaction center obtains sufficient excitation energy from the adjacent antenna pigments, an electron is transferred to the primary electron-acceptor molecule, pheophytin, through a process called photoinduced charge separation.

When a ribosome finishes reading an mRNA molecule, these two subunits split apart.

When a molecule absorbs a quantum of energy that corresponds to a transition from one molecular orbital to another molecular orbital, the resulting electronic excited state is also properly described as an exciton.

When one water molecule is lost another is pulled along by the processes of cohesion and adhesion.

When the activation energy is given in molecular units instead of molar units, e. g., joules per molecule instead of joules per mole, the Boltzmann constant is used instead of the gas constant.

When the molecule relaxes it emits a photon and it returns to a different rotational or vibrational state.

When glycogen stores are not available in the cells, fat ( triacylglycerol ) is cleaved to provide 3 fatty acid chains and 1 glycerol molecule in a process known as lipolysis.

When meat is in its raw state, the iron atom is in the + 2 oxidation state, and is bound to a dioxygen molecule ( O < sub > 2 </ sub >).

When a faster-than-average molecule from A flies towards the trapdoor, the demon opens it, and the molecule will fly from A to B.

When this small molecule is water, it is known as a dehydration reaction ; other possible small molecules lost are hydrogen chloride, methanol, or acetic acid.

When the UV photon strikes a phosphor molecule, it momentarily raises the energy level of an outer orbit electron in the phosphor molecule, moving the electron from a stable to an unstable state ; the electron then sheds the excess energy as a photon at a lower energy level than UV light ; the lower energy photons are mostly in the infrared range but about 40 % are in the visible light range.

When a molecule absorbs a photon, it increases the energy of the molecule.

When a city has arranged things like this you cannot easily change them.

When we arrive at the events concerned in the vanished majority, they, of course, cannot impress us as anything familiar.

When a fisherman brought her up in his arms, still, small, as if she were a child asleep, I began to shudder with a terrible excitement, almost triumphant, that I still cannot account for.

When the signal drive to the amplifier is increased, the output also increases until a point is reached where some part of the amplifier becomes saturated and cannot produce any more output ; this is called clipping, and results in distortion.

When a player is genuinely deceived, he will often lose the point immediately because he cannot change his direction quickly enough to reach the shuttlecock.

When affairs cannot be carried on to success, proprieties and music do not flourish.

When this flag is turned on for a file ( which can be accomplished by a computer program or by a human user ), the file can be examined, but it cannot be modified.

When data is replicated between database servers, so that the information remains consistent throughout the database system and users cannot tell or even know which server in the DBMS they are using, the system is said to exhibit replication transparency.

When he returns home, he finds that he has been so affected by the war that he cannot relate to his friends, including his wife and lover.

When describing graviton interactions, the classical theory ( i. e., the tree diagrams ) and semiclassical corrections ( one-loop diagrams ) behave normally, but Feynman diagrams with two ( or more ) loops lead to ultraviolet divergences ; that is, infinite results that cannot be removed because the quantized general relativity is not renormalizable, unlike quantum electrodynamics.

" When asked why she came back to chess after taking time off to care for her children, she said " I cannot live without chess!

When the king turns over temporalities to the clergy, he places them under his jurisdiction, from which later pronouncements of the popes cannot release them.

When dissolving a lipophilic or amphiphilic substance in a polar environment, the polar molecules ( i. e., water in an aqueous solution ) become more ordered around the dissolved lipophilic substance, since the polar molecules cannot form hydrogen bonds to the lipophilic areas of the amphiphile.

When is true, we cannot consider case 2.

When they react with monoamine oxidase, they permanently deactivate it, and the enzyme cannot function until it has been replaced by the body, which can take about two weeks.

When a phoneme has more than one allophone, the one actually heard at a given occurrence of that phoneme may be dependent on the phonetic environment ( surrounding sounds ) – allophones which normally cannot appear in the same environment are said to be in complementary distribution.

When Phe cannot be metabolized by the body, abnormally high levels accumulate in the blood and are toxic to the brain.

When a person is non-verbal and cannot self report pain, observation becomes critical, and specific behaviors can be monitored as pain indicators.

When the negative team appeals to prima facie, it appeals to the fact that the affirmative team cannot add or amend anything in its plan after being stated in the first affirmative constructive.

When p21 ( WAF1 ) is complexed with CDK2 the cell cannot continue to the next stage of cell division.

When one considers that rhetoric included torture ( it IS persuasive, and was accepted in forensics in the West until very recently ), it is clear that rhetoric cannot be viewed only in academic terms.

When the circuit is broken, the current cannot change instantaneously, which creates a potentially damaging spark across the separating contacts.

When some attractive looking cars come along he stands back, not fitting the badge, since they look so good they cannot be Škodas.

* Non-response bias: When individuals or households selected in the survey sample cannot or will not complete the survey there is the potential for bias to result from this non-response.

" When intermediate rates are present, thermodynamics and statistical mechanics cannot be applied.