Why would you receive an electric shock when you touch the chromework and one particular stove element when it is energized?
YOU have become a conductor. In simple terms: If you touch an energized circuit wire (hot) with one hand, and something metal (that is grounded) with the other hand....ZZAAP!
Check your outlet and the cord for proper grounding, replace the socket for that element, and trace the wiring for that element back to the switch to make sure it's not chaffed.
The heating element of an electric heater is a "resistor", the cord which conducts the electricity is not. The resistance of the element of an electric heater is very high. As current flows through the heating element, it becomes red hot and glows. On the other hand, the resistance of the cord is low. It does not become red hot when current flows through it.
Isotopes are variants of atoms of a particular chemical element, which have differing numbers of neutrons. Atoms of a particular element by definition must contain the same number of protons but may have a distinct number of neutrons which differs from atom to atom, without changing the designation of the atom as a particular element.