Gallium (version 1) - Periodic Table of Videos

[douro20]

Pretty much the entire science of optoelectronics is centered around III-V semiconductor compounds.

[douro20]

Gallium is one of the most important elements in modern electronics; it's used to make what are called III-V semiconductors- that is, semiconductors which are made of elements from the third and fifth groups of the periodic table; they are used in lasers, LEDs, microwave transistors, photodetectors and a whole host of other electronic devices. There is even a company in the Netherlands called Three Five Photonics.

[absurdaproductions]

this is horrible, they didnt ewven melt it...

[red00devil]

Gallium compounds, especially gallium arsenide are researched extensively in the semiconductor industry. Just if you guys wanted to know.... Theres more to Gallium!

[stuntpea]

I've just read that gallium will run out by 2017 and it is used extensively in flat screen TV's

[njimko23]

If not for Gallium, there wouldn't be any blue LEDs and that means no white LED light either.

[moomoomeal]

that scientist is rocking the afro, gallium is cool as well

[W1049]

In 1966 mathey bishop created a Gallium Platinum alloy. The magnetic properties of Platinum is diamagnetic and Gallium also very weakly magnetic but as a alloy it turns out to have incredible magnetic propeties greater than those Neodynmium magnets. The question is Why?

[vitorix24]

i love galium.:) it's beautiful metal

[papasmurfXXX]

ya british people hehehe

in spain it's hot :P

[Kulawendin]

It's funny how he says that every sample is "fantastic" or "beautiful".

[Mattersmatter]

well they are. Do you have any idea how difficult it is to get so many nice little samples?!

[whiterottenrabbit]

LOL

Yeah, it's like whether it is a powder, solid or liquid, it's beautiful every time XD

[punishedexistence]

Gallium isn't important? What about gallium arsenide?

[AgentCROCODILE]

Yeah! I know! Who thumbed you down?

[speedstakerguy]

AFRO!

[juggliac]

how to you translate a tempurature into another tempurature. AKA what is the ratio between Kelvin to Celsius, Celsius to Fahrenheit and Fahrenheit to Kelvin.

[xxx039]

kelvin to celsius all you do is subtract 273. from celsius to kelvin you add 273

celsius to fahrenheit degree C = 5/9 times(degree F - 32)

fahrenheit to kelvin you have to convert degree F to degree C then add 273

degree F =9/5 times (degree C+32 ) to get degree F then you have to do

degree C=5/9 times (degree F-32) then add 273 to get kelvin

[juggliac]

ok, cool, so the 2 magic numbers are 5 and 9.

[demonsparkx]

it is usefull though,L.E.D.'s....

[wickedness1243]

is the Gallium bad for you like Murcury?

[HerrCaZini]

Gallium is toxic, but much less toxic then mercury...

[mdc2296]

how toxic is it

[Phacias]

Mercury creates second most toxic compound known to human. I mean dimethylomercury (is it correct? ;p)

[nemanume]

what was the second element ???

[LukeL007]

botulinum is the most toxic protien known to man. Its LD50 is anywhere from .005-.05 micrograms per kg of body weight. To put this in perspective one tylenol extra strength contains 500 milligrams of painkiller which is 50,000,000-,500,000,000 times more potent. Or for an ld 50 it wound be 1,000,000,000 or one billion times as much to kill an average human

[ck10256]

screens getting smaller

[Acavemancandoit]

my favorite element

[ElveeKaye]

Okay, what is the point of a gallium video if you're not going to melt it in your hand? :o(

[saintaureus]

Ha ha, are there any samples that aren't beautiful and fantastic?

[ElveeKaye]

Some of them are REALLY QUITE beautiful and REALLY QUITE fantastic.

[pyropakman]

Heck no!!!! ALL OF THEM ARE!

haha my friend and I wait for him to say that during every periodic video.

[mdc2296]

@saintaureus dont forget incredible

[AnimeleePocket]

@saintaureus Not that they have. :P

[clappyslapper]

if you heat it up in your hand does it melt and then absorb into your skin?

[leekymkween]

it will melt on your hand but it will not be absorbed as it has low viscosity.

[clappyslapper]

hmm, can you offer more of an explaination, things need to have a higher viscosity to be absorbed?? what about water?

[leekymkween]

To be honest, i wouldn't be too sure.. i'm only in 11th grade lol.

My guesses are:

Low viscosity, which may make it difficult or less readily absorbed or to be passed through skin pores. Water is a moderately viscous molecule. Water is important for cells and metabolic reactions so osmosis can easily occur between a cell and water.

It may be difficult to separate the intermolecular forces of gallium to be absorbed through skin.

[dirtybird2212]

viscosity has nothing to do this being absorbed LSD which is a solid absorbs really quickly into the skin but gallium doesn't because its a metal

[leekymkween]

I've seen in chemistry textbooks gallium being melted in a person's bare palm, so the metal may be harmless/unable to be readily absorbed. However, I've read online that it is possible... not sure.

[clappyslapper]

Thanks for you replies, maybe the prof can offer an opinion?? Keep up the studying and I'm sure you'll go far ;-)

[pyropakman]

It won't do anything. It's used in medical scans as a contrast material

[LukeL007]

Thalium is also used in nuclear medicine despite it being extremely toxic.

[pattyricks18]

If I were to grind solid gallium into a powder or very small samples, could I take that powder or small solids of gallium and with the heat of my hand melt it down back and solidify it into a single solid sample of gallium?

[leekymkween]

that is possible to do as what you're doing is only a physical reaction, not a chemical reaction.

[phyzome]

I was really hoping they would hand-warm it. :-/

[MrMadMoneyMaker]

No, when I asked "how many mL are in one gram" I wanted to know "how many mL are in one gram." Its an element so it stays constant.

By the way, whose the one with the bad attitude and where you trying to help or just failing to make yourself look like you had a brain.

[leekymkween]

Do you mean, how many moles of gallium are in one gram?

You can calculate it using a formula.

moles=mass/molecular mass

[MrMadMoneyMaker]

Thanks for the lecture, I was asking because I thought someone would know. But you know, my life is complete now because someone told me something I already knew.

[MrMadMoneyMaker]

how many mL are in one gram?

[GamblerJustice]

Gallium has a density of 5.904, therefore one mL of Gallium would weigh 5,904 grams.

[MrMadMoneyMaker]

Are you thinking one L of gallium would weigh 5,904? I am no chemist but that would make it much heavier than any element

[frosty956]

5.904 is grams per cubic cm, so on ml would weigh 5.904 grams, not 5904 grams

[GamblerJustice]

Haha, here in Europe we use commas instead of dots.

So when I say 5,904 what I mean is 5.904

[laurdy]

about 0.00007ml

[Slyth66]

cool, thanks! I'm doing a project in physical science. This vid helped me understand it a bit more. AWESOME!

[furChrist]

Is gallium real expensive since they use it in LEDs. I rarley ever see it in bulk.

[vmelkon]

It is expensive because there are no gallium mines. It is a byproduct when other elements are produced like aluminum. It is also expensive if you buy high purity gallium (for electronics industry)

[Wufnu]

That's a shame. I haven't found any toxicity information on Gallium, as of yet, and it seems like it would be a cool demonstration for middle school science courses. Heck, it'd be fun to play with at any age.

[Chaosblade777]

Yeah you could point a hair dryer at it and watch it melt!

[boaterboyhustler]

well cool

[tetranoob]

isnt it used in LED's?

[jonessg3]

It is used in LEDs - in the form of gallium arsenide. The compound is also used in solid state lasers and a number of other related uses.