英语词汇“isotopic number”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

a. Of, pertaining to, or being an isotope or isotopes of an element; isotopic number, the number of neutrons in a nucleus minus the number of protons. Before Soddy coined the word in 1913, isotopic had previously (unknown to him) been used in a different sense (see quot. 1904), but this use did not gain currency.

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isotopic1913

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isotopic number1913

1904 Cohen & Miller in Jrnl. Chem. Soc. 85 1624 Supposing the bromine in the ortho- and meta-positions to retard oxidation more than the chlorine in these positions, the effect should become apparent when the isotopic dichloro-, chlorobromo-, and dibromo-toluenes are oxidised together. [Note] We propose..to employ the word ‘isotopic’..in place of the rather awkward expression ‘similarly substituted’.]

1913 F. Soddy in Nature 4 Dec. 400/1 The same algebraic sum of the positive and negative charges in the nucleus, when the arithmetical sum is different, gives what I call ‘isotopes’ or ‘isotopic elements’, because they occupy the same place in the periodic table. They are chemically identical, and save only as regards the relatively few physical properties which depend upon atomic mass directly, physically identical also.

1919 F. Soddy in Jrnl. Chem. Soc. 115 18 The chemistry of actinium has been enormously simplified by the discovery that mesothorium-2 is isotopic with it, for the latter may be used as an indicator to show in what way the actinium distributes itself after any chemical treatment.

1920 Glasgow Herald 7 Oct. 8 It had now been found that certain elements which hitherto had been stated to have atomic weights fractional were mixtures of isotopes, and such isotopic elements had atomic weights as whole numbers on the oxygen scale.

1921 W. D. Harkins in Nature 14 Apr. 202/2 Let us specify the atoms of this important class as those of isotopic number 0. Then the isotopes of magnesium of atomic weights 24, 25, and 26 will have isotopic numbers 0, 1, and 2.

1921 W. D. Harkins in Nature 14 Apr. 202/2 The isotopic number n is the number which, when added to twice the atomic number, gives the atomic weight.

1933 F. W. Aston Mass-spectra & Isotopes xiv. 176 Atoms of isotopic number 0, such as C¹², O¹⁶, Mg²⁴, etc., predominate in a marked degree. Abundance is much less for isotopic number 1 such as F¹⁹, Na²³, Al²⁷, decreases again for 2:—N¹⁴, Ne²², and becomes practically zero for 3:—Cl³⁷.

1942 J. D. Stranathan ‘Particles’ of Mod. Physics v. 200 Considerable isotopic data has been obtained from studies of hyperfine structure.

1954 Sci. News 34 51 The next simplest use of the mass spectrometer is to measure the quantity of one isotope of an element compared with another—the isotopic ratio as it is called.

1956 A. H. Compton Atomic Quest i. 52 The isotopic separation of U-235 from U-238.

1957 G. E. Hutchinson Treat. Limnol. I. viii. 549 A study of the isotopic constitution of the sulfur in the sulfate of rain.

1971 J. Z. Young Introd. Study Man v. 82 Many of the elements exist in isotopic forms, which break down spontaneously.

单词	isotopic number
释义	> as lemmas isotopic number a. Of, pertaining to, or being an isotope or isotopes of an element; isotopic number, the number of neutrons in a nucleus minus the number of protons. Before Soddy coined the word in 1913, isotopic had previously (unknown to him) been used in a different sense (see quot. 1904), but this use did not gain currency. ΘΚΠ the world > matter > chemistry > elements and compounds > isotopes > [adjective] isotopic1913 the world > matter > chemistry > atomic chemistry > [noun] > nucleus > isotopic number isotopic number1913 1904 Cohen & Miller in Jrnl. Chem. Soc. 85 1624 Supposing the bromine in the ortho- and meta-positions to retard oxidation more than the chlorine in these positions, the effect should become apparent when the isotopic dichloro-, chlorobromo-, and dibromo-toluenes are oxidised together. [Note] We propose..to employ the word ‘isotopic’..in place of the rather awkward expression ‘similarly substituted’.] 1913 F. Soddy in Nature 4 Dec. 400/1 The same algebraic sum of the positive and negative charges in the nucleus, when the arithmetical sum is different, gives what I call ‘isotopes’ or ‘isotopic elements’, because they occupy the same place in the periodic table. They are chemically identical, and save only as regards the relatively few physical properties which depend upon atomic mass directly, physically identical also. 1919 F. Soddy in Jrnl. Chem. Soc. 115 18 The chemistry of actinium has been enormously simplified by the discovery that mesothorium-2 is isotopic with it, for the latter may be used as an indicator to show in what way the actinium distributes itself after any chemical treatment. 1920 Glasgow Herald 7 Oct. 8 It had now been found that certain elements which hitherto had been stated to have atomic weights fractional were mixtures of isotopes, and such isotopic elements had atomic weights as whole numbers on the oxygen scale. 1921 W. D. Harkins in Nature 14 Apr. 202/2 Let us specify the atoms of this important class as those of isotopic number 0. Then the isotopes of magnesium of atomic weights 24, 25, and 26 will have isotopic numbers 0, 1, and 2. 1921 W. D. Harkins in Nature 14 Apr. 202/2 The isotopic number n is the number which, when added to twice the atomic number, gives the atomic weight. 1933 F. W. Aston Mass-spectra & Isotopes xiv. 176 Atoms of isotopic number 0, such as C¹², O¹⁶, Mg²⁴, etc., predominate in a marked degree. Abundance is much less for isotopic number 1 such as F¹⁹, Na²³, Al²⁷, decreases again for 2:—N¹⁴, Ne²², and becomes practically zero for 3:—Cl³⁷. 1942 J. D. Stranathan ‘Particles’ of Mod. Physics v. 200 Considerable isotopic data has been obtained from studies of hyperfine structure. 1954 Sci. News 34 51 The next simplest use of the mass spectrometer is to measure the quantity of one isotope of an element compared with another—the isotopic ratio as it is called. 1956 A. H. Compton Atomic Quest i. 52 The isotopic separation of U-235 from U-238. 1957 G. E. Hutchinson Treat. Limnol. I. viii. 549 A study of the isotopic constitution of the sulfur in the sulfate of rain. 1971 J. Z. Young Introd. Study Man v. 82 Many of the elements exist in isotopic forms, which break down spontaneously. extracted from isotopicadj. < as lemmas
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> as lemmas