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Rare earth elements

rare earth elements --> lanthanides

Those elements with atomic numbers 57-71 which closely resemble one another chemically and were once difficult to separate from one another.

Synonym: rare earth elements.

Origin: Lanthanum, first element of the series


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Re: Why are leaves green?

... don't use H2O to create O2, they use different elements, most commonly H2S to create S. They do ... die is exposed to too much of it. The early earth had an atmosphere without oxygen: purple bacteria ... whereever they wanted (now they are kindof rare) and dominated the seas. Purple bacteria evolved ...

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by stauffie
Fri Apr 06, 2012 2:00 pm
 
Forum: Botany Discussion
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by Nadas Moksha
Fri Dec 15, 2006 8:00 am
 
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by Nadas Moksha
Tue Aug 15, 2006 12:24 am
 
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Views: 5563319


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