n
(physics, dated) The isotope of radon ²¹⁹₈₆Rn
n
(physics) The most abundant of the two stable isotopes of carbon, ¹²₆C, having six protons and six neutrons; it is the standard for atomic weight and is used to define the mole.
n
(physics) a radioactive isotopes of carbon, ¹⁴₆C, having six protons and eight neutrons; it is used in radiocarbon dating
n
(physics) The major stable isotope of chromium, ⁵²₂₄Cr, having 24 protons and 28 neutrons; it amounts to about 84% of the element in nature
n
A heavy isotope bonded to another heavy isotope, usually applied to ¹³C and ¹⁸O in carbonates.
n
(dated) The unstable, radioactive, chemical element with atomic number 118, now named oganesson.
n
(physics) A doubly magic isotope of hassium - ²⁷⁰₁₀₈Hs; it is the longest-lived one known, having a half-life of several seconds.
n
(nuclear physics) An ionized atom that is usually heavier than helium.
n
(physics) A helium ion, the nucleus of a helium-3 atom. Formula: ³He⁺² ; Symbol: h
n
Any atomic system containing a helium nucleus and an antihelium nucleus.
n
(physics) The normal isotope of helium, ⁴₂He, that has two neutrons
adj
(physics, chemistry) Having a very large atomic number
n
(physics) A nuclear complex formed from a helium nucleus be replacement of a neutron by a hyperon
n
(physics, medicine) The radioactive isotope of iodine, ¹²⁵₅₃I, having a half-life of 59 days; used as a radiation therapy.
n
(physics, medicine) The radioactive isotope of iodine, ¹³¹₅₃I, having a half-life of eight days; used as a medical tracer
n
Abbreviation of liquid helium (a liquid composed of the liquid phase of molecular (atomic) helium (He)) [(physics) The liquified form of helium that does not solidify even at absolute zero; it shows unusual properties, such as superfluidity, due to quantum effects.]
n
(chemistry, medicine, informal) A device used to extract from a source of decaying molybdenum-99 the metastable isotope ⁹⁹ᵐTc of technetium, which is the most commonly used medical radioisotope.
n
(physics) A rare stable isotope of oxygen, ¹⁷₈O, having eight protons and nine neutrons; it amounts to 0.037% of the element in nature
n
(physics) The form of the helium atom in which the spins of the two electrons form a singlet state (a state with zero total spin)
n
(physics) A radioactive isotope of polonium, ²¹⁰₈₄Po, having a half-life of 138 days; it as used as a reference alpha emitter in the calibration of radiation counters
n
(physics) A naturally-occurring radioactive isotope of potassium, ⁴⁰₁₉K, having nineteen protons and twenty-one neutrons, and a half-life of 1.3 billion years; it is the chief source of natural radioactivity in living tissue
n
(physics) An artificially produced radioactive isotope of potassium, ⁴²₁₉K, having a half-life of 12.4 hours; used in medicine as a tracer
n
(physics) An artificially produced radioactive isotope of potassium, ⁴³₁₉K, having a half-life of 22 hours; used in medicine as a tracer
n
(physics) The lightest and most common isotope of hydrogen, having a single proton and no neutrons: ¹₁H
n
(physics) Any radioactive isotope of an actinide
n
(physics) The radioactive isotope thorium-228
n
The most stable isotope of this element, ²²²₈₆Rn.
n
(physics) The only stable isotope of sodium, ²³₁₁Na, having eleven protons and twelve neutrons
n
(physics) The radioactive isotope of strontium, ⁹⁰₃₈Sr, that is present in the fallout from nuclear explosions and, being chemically similar to calcium, is accumulated in the bones
n
The radioactive isotope of tellurium ¹³⁰₅₂Te
n
(physics) A radioactive isotope of the element hydrogen (symbol T or ³₁H) having one proton and two neutrons.
n
(physics) the atomic nucleus of a tritium atom, consisting of a proton and two neutrons
n
(physics) An isotope of yttrium, ⁹⁰₃₉Y, that is used in radiotherapy
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