lanthanumn.

/ˈlanθənəm/

Forms: Also 1800s lant(h)anium.

Etymology: < Greek λανθάνειν to escape notice (see quot. 1841).

Chemistry.

A chemical element belonging to the group of rare-earth metals, found in certain minerals, e.g. cerite; it was discovered by Mosander 1839–41. Symbol La. Also attributive.Originally Ln was also used as a symbol for this element.

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the world > matter > chemistry > elements and compounds > metals > specific elements > lanthanum > [noun]

lanthanum1841

La1842

Ln1842

1841 W. T. Brande Man. Chem. (ed. 5) 877 Another metallic oxide, which, as it has hitherto lain concealed in oxide of cerium, he [sc. Mosander] designates Lantanum (λανθανειν, to lurk).

1842 E. A. Parnell Elements Chem. Anal. (1845) 338 Oxide of lantanium.

1849 D. Campbell Pract. Text-bk. Inorg. Chem. 167 Lanthanum.

1852 H. B. Jones & A. W. Hoffman Fownes's Man. Elem. Chem. (ed. 4) 286 Metallic lanthanium is prepared like cerium.

1852 H. B. Jones & A. W. Hoffman Fownes's Man. Elem. Chem. (ed. 4) 286 A tolerably pure lanthanium-salt may be obtained.

1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 386 Lanthanum sulphate forms small prismatic crystals.

This entry has not yet been fully updated (first published 1901; most recently modified version published online December 2020).

单词	lanthanum
释义	lanthanumn. /ˈlanθənəm/ Forms: Also 1800s lant(h)anium. Etymology: < Greek λανθάνειν to escape notice (see quot. 1841). Chemistry. A chemical element belonging to the group of rare-earth metals, found in certain minerals, e.g. cerite; it was discovered by Mosander 1839–41. Symbol La. Also attributive.Originally Ln was also used as a symbol for this element. ΘΚΠ the world > matter > chemistry > elements and compounds > metals > specific elements > lanthanum > [noun] lanthanum1841 La1842 Ln1842 1841 W. T. Brande Man. Chem. (ed. 5) 877 Another metallic oxide, which, as it has hitherto lain concealed in oxide of cerium, he [sc. Mosander] designates Lantanum (λανθανειν, to lurk). 1842 E. A. Parnell Elements Chem. Anal. (1845) 338 Oxide of lantanium. 1849 D. Campbell Pract. Text-bk. Inorg. Chem. 167 Lanthanum. 1852 H. B. Jones & A. W. Hoffman Fownes's Man. Elem. Chem. (ed. 4) 286 Metallic lanthanium is prepared like cerium. 1852 H. B. Jones & A. W. Hoffman Fownes's Man. Elem. Chem. (ed. 4) 286 A tolerably pure lanthanium-salt may be obtained. 1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 386 Lanthanum sulphate forms small prismatic crystals. This entry has not yet been fully updated (first published 1901; most recently modified version published online December 2020). < n.1841
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