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...olutely stable. In between the binodal and the spinodal, mixtures may be [[metastable]]: staying mixed (or unmixed) absent some large disturbance. The region bey ...atures and concentrations separates into parts. The initial mix of the two isotopes spontaneously separates into <chem>^{4}He</chem>-rich and <chem>{}^3He</che ...

...into [[metastable]] ions. The combination will extend the lifetime of the metastable ions (10⁻⁶ seconds). The methane will cool the electrons during ...

...fer by the number of neutrons, and therefore the masses and volumes of two isotopes are different; these differences give rise to the [[isotopic shift]] on ato ...nt of a new technique, that permitted spectroscopy with isomers, which are metastable nuclei. This too happened only in the 1950s. ...

...pe is given by the number of protons and neutrons. From left to right, the isotopes are [[hydrogen|protium]] (¹H) with zero neutrons, [[deuterium]] ...er]]s) due to different numbers of [[neutron]]s in their nuclei. While all isotopes of a given element have similar chemical properties, they have different [[ ...

...nucleus containing two protons along with two neutrons, depending on the [[Isotopes of helium|isotope]], held together by the [[strong force]]. Unlike for [[hy ...ath> (with <math> \psi_a = \psi_{1s}, \psi_b = \psi_{2s} </math>) is the metastable ground state. ...

...at it involves the intermediate metastable excited state(s) of the nuclei. Metastable states are often characterized by high [[nuclear spin]], requiring a change ...t..13P2028F |s2cid=125779702 }}</ref> Typically, these use Co-60 or Cs-137 isotopes as the radiation source. ...

...but the rate of change is negligibly slow, the system is said to be in a [[metastable]] state. The equation of chemical equilibrium can be expressed symbolically ...ample, in a radioactive [[decay chain]] the concentrations of intermediate isotopes are constant because the rate of production is equal to the rate of decay. ...

...en]] and [[helium-4]]. Trace amounts of [[deuterium]], [[helium-3]], and [[Isotopes of lithium#Lithium-7|lithium-7]] also form. At the end of this epoch, the s Small amounts of [[tritium]] (another hydrogen isotope) and [[Isotopes of beryllium|beryllium]]-7 and -8 are formed, but these are unstable and ar ...

...prep.org/gcurran/sho/sho/lessons/lesson35.htm|title=Elemental Notation and Isotopes|publisher=Science Help Online|access-date=2008-08-27|url-status=dead|archiv ...thus a terrestrial average and a function of the relative abundance of the isotopes of the constituent atoms on Earth. The molar mass is appropriate for conver ...

...without detection, including [[Radium isotope|²²⁶Radium]] and [[Isotopes of polonium|²¹⁰Polonium]].<ref>[https://web.archive.org/web/2009 ...hyroid enlargement, and certain forms of thyroid cancer. The radioactive [[Isotopes of iodine|iodine isotope]] used is ¹³¹Iodine, a predominant [[be ...