The speed of sound in any chemical element in the fluid phase has one temperature-dependent value.
In the solid phase, different types of sound wave may be propagated, each with its own speed: among these types of wave are longitudinal (as in fluids), transversal, and (along a surface or plate) extensional.
[1] As quoted at http://www.webelements.com/ from this source: As quoted from various sources in an online version of: As quoted from this source in an online version of: David R. Lide (ed), CRC Handbook of Chemistry and Physics, 84th Edition.
Boca Raton, Florida, 2003; Section 6, Fluid Properties; Thermal Properties of Mercury Dwight E. Gray (ed), American Institute of Physics Handbook.
Boca Raton, Florida, New York, 1957.