It really depends on what kind of strength you are looking for, a triangle is the strongest shape when rigidity is what is needed (so when you want to have a strong cantilever structure or a general structure that can resist a variety of stresses). It's difficult to say what might be the second strongest shape in such circumstances, but maybe a triangle that is not equilateral, but this is an over simplification. An octet-truss is the strongest structure for cantilevering because of the strength of the triangle
However if its 'hardness' you're looking for, or resistance to purely compression, a tessellation of hexagons is your strongest shape, and therefore perhapse an irregular hexagon is your second strongest. A lorimerlite framework is the strongest truss under compression because of the strength of hexagons.
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Gases don't form inter-molecular bonds, as the molecules are free floating. Solids would have the strongest, being held rigidly in a single shape, unlike liquids.
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