Hydrogen is metal or not?

[tin llenaresas]

what is hydrogen?? a metal or nonmetal?

there are times/characteristics wherein hydrogen could be classified as a metal and times where it could be a nonmetal, even a metalloid..

so what is hydrogen??

anybody knows the answer??help me pls..

 

[Severian596]

metallic element: any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.

When does hydrogen act like any of these? You mentioned that "sometimes it can be classified as a metal," but I'm unfamiliar with these circumstances. Can you explain?

 

[tin llenaresas]

"There are many reasons for including hydrogen among the elements in Group IA. It forms compounds (such as HCl and HNO3) that are analogs of alkali metal compounds (such as NaCl and KNO3). Under conditions of very high pressure, it has the properties of a metal. (It has been argued, for example, that any hydrogen present at the center of the planet Jupiter is likely to be a metallic solid.) Finally, hydrogen combines with a handful of metals, such as scandium, titanium, chromium, nickel, or palladium, to form materials that behave as if they were alloys of two metals."

reference: http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch10/hydrogen.html [Broken]

 

[Severian596]

It's good to see that you did your homework! But let's look at one definition of metallic elements again:

metallic element: any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.

I would exclude specific and rare circumstances for the sake of using similar terms as the definition. The definition sounds like a blanket definition that applies to "normal" circumstances, not "center-of-jupiter" circumstances.

:)

"There are many reasons for including hydrogen among the elements in Group IA. It forms compounds (such as HCl and HNO3) that are analogs of alkali metal compounds (such as NaCl and KNO3). Under conditions of very high pressure, it has the properties of a metal. (It has been argued, for example, that any hydrogen present at the center of the planet Jupiter is likely to be a metallic solid.) Finally, hydrogen combines with a handful of metals, such as scandium, titanium, chromium, nickel, or palladium, to form materials that behave as if they were alloys of two metals."

reference: http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch10/hydrogen.html [Broken]