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Name: laurens
Status: N/A
Age: N/A
Location: N/A
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Date: Before 1993


Question:
Is hydrogen a metallic element? If not, why is it on the left side of the periodic table?



Replies:
Hydrogen is not a metallic element despite the placement on the left side of the periodic chart. I think that most modern periodic tables place it both on the upper left (its periodic position) and on the upper right next to Helium (its position as a gas). The reason that it was put on the upper left of the table originally is because the column IA is home to all elements with 1 electron in the outermost s-orbital. Hydrogen certainly meets this criteria, however it is physical properties are more consistent with the gases grouped at the upper right.

woodford


Just to expand on Mike's answer a little. The most common phase of hydrogen (that is, pure hydrogen) is hydrogen gas. Two hydrogens form a chemical bond to form H2. H2 does have a lot of physical properties which are similar to the upper-right gases. However, solid hydrogen can be formed at cryogenic temperatures (REAL cold) and there is some limited evidence that it may be metallic (i.e. conduct electrons like a metal does). There are some decent theoretical reasons for this to happen too...but it is still an issue of some dispute if I recall.

Robert Topper



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