atomic numbern.

Brit.

/əˌtɒmɪk ˈnʌmbə/, U.S.

/əˌtɑmɪk ˈnəmbər/

Origin: Formed within English, by compounding. Etymons: atomic adj., number n.

Etymology: < atomic adj. + number n.

1. Chemistry. A property of elements and compounds more or less equivalent to atomic weight and molecular weight. Now disused.See note at atomic weight n.

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the world > matter > physics > atomic nucleus > [noun] > number of chemical element

atomic number1821

the world > matter > chemistry > atomic chemistry > [noun] > atoms > atomic number

atomic number1821

1821 T. Thomson in Ann. Philos. New Ser. 1 5 The following table exhibits the numbers assigned to the atom of these bodies... They approach very nearly to the other atomic numbers contained in the table.

1843 S. L. Dana Muck Man. (ed. 2) ii. 31 The combining number of carbon is 6, and of oxygen 8, then 1 carbon = 6, and 2 oxygen (8 × 2) = 16. Then the atomic number of carbonic acid is 22, (6 + 16 = 22).

1851 G. Dodd Knight's Cycl. Industry All Nations 250/1 According to his [sc. Dalton's] view, the atomic number, or atomic weight, or atomic equivalent, of any substance, represents the relative quantity or weight of each which will combine with other substances.

1904 Proc. Amer. Philos. Soc. 43 126 He very much doubted whether it was the complete removal of any molybdenum content from the tungstic acid which occasioned the rise in the atomic number.

2. Physics. A number characteristic of an individual element, being the number of unit positive charges (protons) in the nucleus of its atom, which determines its place in the periodic table. Symbol Z.This sense was introduced by Moseley following his experiments confirming a suggestion by Van den Broek that the nuclear charge of an element (taking hydrogen as 1) is equal to its ordinal number in the periodic table. This idea had been prefigured by J. A. R. Newlands ( Chem. News (1864) 24 Aug. 94) before the atomic nucleus had been discovered (‘a separate number being attached to each element having a distinct equivalent of its own’).

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1913 H. G. J. Moseley in London, Edinb., & Dublin Philos. Mag. 6th Ser. 26 1031 We are therefore led by experiment to the view that N is the same as the number of the place occupied by the element in the periodic system. This atomic number is then for H 1.

1922 T. M. Lowry Inorg. Chem. xxxi. 549 The valencies of the elements are plotted against their atomic numbers in Fig. 211.

1927 N. V. Sidgwick Electronic Theory of Valency i. 11 What Soddy has called an isotope—an element of the same atomic number but a different atomic weight.

1962 Appl. Spectrosc. 16 159/1 Light elements are defined as those elements having an atomic number less than 25.

1978 G. C. Hill & J. S. Holman Chem. in Context iv. 47 Chlorine consists of two isotopes; each has an atomic number of 17, but they have different isotopic masses, 35 and 37.

2003 Environmental Health Perspectives 111 1290/1 Elements heavier than argon (atomic number Z = 19).

This entry has been updated (OED Third Edition, December 2008; most recently modified version published online December 2021).

单词	atomic number
释义	atomic numbern. Brit. /əˌtɒmɪk ˈnʌmbə/, U.S. /əˌtɑmɪk ˈnəmbər/ Origin: Formed within English, by compounding. Etymons: atomic adj., number n. Etymology: < atomic adj. + number n. 1. Chemistry. A property of elements and compounds more or less equivalent to atomic weight and molecular weight. Now disused.See note at atomic weight n. ΘΚΠ the world > matter > physics > atomic nucleus > [noun] > number of chemical element atomic number1821 the world > matter > chemistry > atomic chemistry > [noun] > atoms > atomic number atomic number1821 1821 T. Thomson in Ann. Philos. New Ser. 1 5 The following table exhibits the numbers assigned to the atom of these bodies... They approach very nearly to the other atomic numbers contained in the table. 1843 S. L. Dana Muck Man. (ed. 2) ii. 31 The combining number of carbon is 6, and of oxygen 8, then 1 carbon = 6, and 2 oxygen (8 × 2) = 16. Then the atomic number of carbonic acid is 22, (6 + 16 = 22). 1851 G. Dodd Knight's Cycl. Industry All Nations 250/1 According to his [sc. Dalton's] view, the atomic number, or atomic weight, or atomic equivalent, of any substance, represents the relative quantity or weight of each which will combine with other substances. 1904 Proc. Amer. Philos. Soc. 43 126 He very much doubted whether it was the complete removal of any molybdenum content from the tungstic acid which occasioned the rise in the atomic number. 2. Physics. A number characteristic of an individual element, being the number of unit positive charges (protons) in the nucleus of its atom, which determines its place in the periodic table. Symbol Z.This sense was introduced by Moseley following his experiments confirming a suggestion by Van den Broek that the nuclear charge of an element (taking hydrogen as 1) is equal to its ordinal number in the periodic table. This idea had been prefigured by J. A. R. Newlands ( Chem. News (1864) 24 Aug. 94) before the atomic nucleus had been discovered (‘a separate number being attached to each element having a distinct equivalent of its own’). ΚΠ 1913 H. G. J. Moseley in London, Edinb., & Dublin Philos. Mag. 6th Ser. 26 1031 We are therefore led by experiment to the view that N is the same as the number of the place occupied by the element in the periodic system. This atomic number is then for H 1. 1922 T. M. Lowry Inorg. Chem. xxxi. 549 The valencies of the elements are plotted against their atomic numbers in Fig. 211. 1927 N. V. Sidgwick Electronic Theory of Valency i. 11 What Soddy has called an isotope—an element of the same atomic number but a different atomic weight. 1962 Appl. Spectrosc. 16 159/1 Light elements are defined as those elements having an atomic number less than 25. 1978 G. C. Hill & J. S. Holman Chem. in Context iv. 47 Chlorine consists of two isotopes; each has an atomic number of 17, but they have different isotopic masses, 35 and 37. 2003 Environmental Health Perspectives 111 1290/1 Elements heavier than argon (atomic number Z = 19). This entry has been updated (OED Third Edition, December 2008; most recently modified version published online December 2021). < n.1821
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