protiumn.

Brit.

/ˈprəʊtɪəm/, U.S.

/ˈproʊdiəm/,

/ˈproʊʃ(ə)m/

Origin: A borrowing from Greek, combined with an English element. Etymons: Greek πρῶτος , -ium suffix.

Etymology: < ancient Greek πρῶτος first (see proto- comb. form) + -ium suffix. Compare deuterium n., tritium n.

Chemistry.

The ordinary isotope of hydrogen, having only a proton in the nucleus. Symbol ¹H, H¹. Cf. deuterium n., tritium n.Protium forms at least 99.98 per cent (by volume) of naturally occurring hydrogen.

ΘΚΠ

the world > matter > chemistry > elements and compounds > hydrogen > [noun] > isotopes

D1933

deuterium1933

diplogen1933

protium1933

tritium1933

T1948

1933 H. C. Urey et al. in Jrnl. Chem. Physics 1 513/1 We wish to propose that the names for the H¹ and H² isotopes be protium and deuterium.

1957 G. E. Hutchinson Treat. Limnol. I. iii. 211 Hydrogen has two stable isotopes, H¹, sometimes called protium, and H² or D, usually called deuterium.

1989 R. Dryer & G. Lata Exper. Biochem. i. iii. 44 Ordinary hydrogen, or protium, is stable.

2006 Fusion Engin. & Design 81 90/2 The isotope separation system..separates the hydrogen isotopes into protium, deuterium and tritium.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	protium
释义	protiumn. Brit. /ˈprəʊtɪəm/, U.S. /ˈproʊdiəm/, /ˈproʊʃ(ə)m/ Origin: A borrowing from Greek, combined with an English element. Etymons: Greek πρῶτος , -ium suffix. Etymology: < ancient Greek πρῶτος first (see proto- comb. form) + -ium suffix. Compare deuterium n., tritium n. Chemistry. The ordinary isotope of hydrogen, having only a proton in the nucleus. Symbol ¹H, H¹. Cf. deuterium n., tritium n.Protium forms at least 99.98 per cent (by volume) of naturally occurring hydrogen. ΘΚΠ the world > matter > chemistry > elements and compounds > hydrogen > [noun] > isotopes D1933 deuterium1933 diplogen1933 protium1933 tritium1933 T1948 1933 H. C. Urey et al. in Jrnl. Chem. Physics 1 513/1 We wish to propose that the names for the H¹ and H² isotopes be protium and deuterium. 1957 G. E. Hutchinson Treat. Limnol. I. iii. 211 Hydrogen has two stable isotopes, H¹, sometimes called protium, and H² or D, usually called deuterium. 1989 R. Dryer & G. Lata Exper. Biochem. i. iii. 44 Ordinary hydrogen, or protium, is stable. 2006 Fusion Engin. & Design 81 90/2 The isotope separation system..separates the hydrogen isotopes into protium, deuterium and tritium. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1933
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