What do these elements have in common?

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What do these elements have in common?

Postby Cyprium on April 21st, 2015, 12:45 am 

A long time ago, on my periodic table, I marked five elements. There was something that they all had in common, as far as I new just them, or at least primarily them. The markings however do not indicate what that thing was.... I thought I'd remember but...

The elements are Li, Na, K, Ca, and Ba.

Does anyone have any clue what it could have been that I marked them for? It's driving me nuts. XD
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Re: What do these elements have in common?

Postby BioWizard on April 21st, 2015, 6:43 am 

I can't think of any property that is specific to just these elements...
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Re: What do these elements have in common?

Postby Braininvat on April 21st, 2015, 9:10 am 

All have medical uses?
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Re: What do these elements have in common?

Postby BioWizard on April 21st, 2015, 11:59 am 

I tried to come up with a biologically relevant property like that BiV, but then the absence of Mg was too salient.
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Re: What do these elements have in common?

Postby Eclogite on April 21st, 2015, 3:13 pm 

Well, Na, Ca and K are the main cations present in the feldspar family. The plagioclase feldspars form a continuous series from the Na and Ca end members, while the potassium variety orthoclase is another important rock forming mineral. Ba feldspars are also known and lithium can, I think, occur as a minor constituent.

If this was the common ground it would explain the omission of magnesium, since it tends to concentrate in the various ferro-magnesian minerals, olivine, pyroxenes and amphiboles. Other than that I can't see a connection.
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Re: What do these elements have in common?

Postby Cyprium on April 21st, 2015, 10:27 pm 

@Eclogite: I guess there's a small chance that was it. Did read a little of some geology books last year. Though it does seem like things I'd mark them for and I don't remember any of that. Hmmm.
like I said, it may not be only those elements, maybe they're just standouts/main examples of something typically used. though that sadly makes it really hard to narrow down....

Thanks for trying guys.
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Re: What do these elements have in common?

Postby BadgerJelly on April 23rd, 2015, 1:41 pm 

They are all metals aren't they ?

Maybe tensile strength or something physical ?>
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Re: What do these elements have in common?

Postby Braininvat on April 23rd, 2015, 4:27 pm 

3 are alkali metals, 2 are alkaline earth metals. All rarely if ever seen in elemental form, so I doubt tensile strength would be important? Who knows.
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Re: What do these elements have in common?

Postby TaliaAS on May 9th, 2015, 12:32 pm 

they can be measured by flame photometers?
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Re: What do these elements have in common?

Postby Hendrick Laursen on May 18th, 2015, 4:39 pm 

TaliaAS » May 9th, 2015, 6:32 am wrote:they can be measured by flame photometers?

But aren't the only ones being so.
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Re: What do these elements have in common?

Postby Hendrick Laursen on May 18th, 2015, 5:03 pm 

All are silvery white. (But are so Rb, Mg, etc. Doesn't distinguish them.)
All were found by Davy, except Li.
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Re: What do these elements have in common?

Postby Natural ChemE on May 23rd, 2015, 5:44 pm 

Yeah, flame photometer detection does seem like the best fit. There's more on Flame Photometry.

Besides that I'd guess that, I'd guess that you were writing down solubility rules in Chem 101. The first one refers to "Li+, Na+, K+, Cs+, Rb+", which looks a lot like "Li, Na, K, Ca, and Ba" copied down in haste.

If you knew the context in which you were writing it down, e.g. a particular class or in pursuit of a particular kind of research, that'd help us guess.
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Re: What do these elements have in common?

Postby smfood on December 22nd, 2015, 5:21 am 

Yellow, pale purple, brick red, yellow green, red, green, purple red, purple
haha I think this problem has no solution
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