Most metals.
Steel isn't an element but, yes, it is a conductor.
The element that is a good conductor that begins with the letter S is Selenium. Another choice could be Scandium.
is a semi-metal
Gold.
nonmetal
This element is a metalloid.
At standard temperature and pressure (STP), the element that is malleable and a good conductor of electricity is copper.
Both Electricity and Heat are forms of energy. If an element were a poor conductor of both it would simply mean that particular element was a poor conductor of energy.
The 47th element on the periodic table is silver, with the symbol Ag. Silver is a transition metal with atomic number 47 and is known for its use in jewelry, photography, and as a conductor of electricity.
Silicon or Germanium Graphite is an excellent electrical conductor
Copper
Silver it is