Recent content by questar

A couple of good places to start for those that care to know. http://www.nndc.bnl.gov/content/elements.html ... and the book entitled "Nature's Building Blocks" by John Emsley that states "A pure sample of metallic praseodymium was first produced in 1931." Praseodymium is a metal.

Just a little disrespectful... assuming of course that the word "disrespectful" is not an absolute adjective.

Welsbach discovered praseodymium and neodymium from Mosander's "didymium" when he separared them in the form of their oxides... a pure sample of metallic praseodymium was was not produced in 1931, not 1885.

Who first isolated praseodymium in 1931? To date, I've been unable to find a single source that consistently provides names and years or both for the first isolation of every element. Thus far I've names and years of the first recorded isolations of each element up to praseodymium (carbon...

It is true that beryllium is much less abundant than carbon, oxygen and nitrogen... but what about the essential trace elements? Beryllium is just as abundant as cobalt and copper, and more abundant than both iodine and selenium. All four are considered essential elements, all four are more rare...

In regards to biological benefits, I believe this outline is fairly accurate. It begins with the elements of greatest mass, then the lesser essentials, then on to those that are suspected of being lesser essentials, and finally those with unknown benefits in what remains of the indigenous and...

So basically all of the elements that can be found in the body are the same as those that can be found in the environment that the body inhabits. The synthetic elements are unlikely to be found in the body for the same reason that they are unlikely to be found in the environment- and that reason...

It's my understanding that all elements/atomic numbers 1-98 are naturally occurring, albeit some only in minute amounts. Therefore it seems reasonable to me that all these elements, including as you pointed out, the noble gases, could be found in "metaminute" amounts within the human body...

I'm trying to determine the elements that are present in the human body. Online I'm finding inconsistent determinations. I'm reading that some lanthanoids are present, then on another site, none are present, though I see no reason that all lanthanoids would be present to some miniscule degree...

This thread does justice to a question put forth online several times and, as far as I can tell is only answered in part. I believe this question warrants a distinct and succinct answer. What I'm finding online is summarized below, and as one can see... there is something missing. I've been...