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Ferrum - Cobaltum - Niccolum Cu Ag
Geralis
Nomen, symbolus, numerus	Cobaltum, Co, 27
Familia	transitionis metallum
Grex, Periodus, Columna	9, 4 , d
Densitas	8.90 g/cm³
Color	metallicum argentoalbum
Proprietates atomicae
Massa atomica	58.933195(5) g/mol
Atomicus radius	135 (145) picometra
Covalens radius	126 pm

Cobaltum (-i, n.), cum signo Co, est elementum chemicum, metallum, numeri atomici 27.

[recensere] De nomine

Verbum "cobaltum" derivatum est a verbo germanico Kobold, quod manem malum significat, ita appellatum a metallicis qui in fodinis laboraverunt, quia veneficium fuit et aerumnas multas fecit in aerem elementorum aliorum effodendo, ut qualitatem eorum diminuit. Etiam putabatur a metallicis ut illi Kobolde in fodinas argenti nocte intrarent argentum cleptum et cobaltium repositum. Nomen ultimo fortasse est derivatum ab verbo graeco antiquo Κόβαλος, quod "furcifer" significat, et nonnulli id dicunt fontem etiam radicem esse verbi Kobold, verbi anglici goblin, et cobalti scilicet ipsi, tametsi Lexicon Linguae Anglica Oxoniensis hanc etymologiam esse incertam dicit.

[recensere] Proprietates

Vitra a cobalto turpata.

Cobaltum durum magneticum est argentoalbum.

Cobaltum-60, isotopium manu factum, quod radioactivum est, ad morbos cancrosos medicandos.

Cum elementis aliis mixtum, Cobaltum colorem vitri ad caeruleum mutat.

Pulvis cobaltii perfacile in incendiam ducitur.

Est veneficium et radioactivum. Radios gammosos emmitit, qui adhibetur bacteria in fructibus holeribusque sterilia factum.

[recensere] Geologia

Cobalti aes

Cobaltum saepius existit in forma aeris. Non solet solum effodier, immo est productum secundum niccoli et cupri productionis. Maxima cobalti deposita in Respublica Congensi, Sina, Zambia, Russia et Australia. Invenitur etiam in Finnia, Adrabigania, et Casachia.

[recensere] Nexus externi

• Facta de cobalto
• WebElements.com – Cobalt

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