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ретки земни елементи

Seventeen closely related elements, the lanthanoid series, from atomic numbers 57 through 71 on the Periodic Table (some people define the series from atomic numbers 58 through 71). These elements usually occur together and are useful in geochemical modeling.

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Actividade/ Sector: Educação Category: Teaching

говорни способности

skills or abilities in oral speech, ability of speech, fluency in speaking