Definition:Lead (Chemical Element)
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Chemical Element
Lead is the chemical element that has $82$ protons in the nuclei of its atoms
Its chemical symbol is $\text {Pb}$.
Isotopes
Pb-$208$
Lead-$208$ is the isotope of lead which has $126$ neutrons in addition to its $82$ protons.
Pb-$208$ is the heaviest stable isotope of any element.
Linguistic Note
The word lead is pronounced in this context led, not leed.
In modern culture it is used figuratively as a metaphor for heaviness.
Its symbol $\text {Pb}$ derives from the Latin word for lead, that is, plumbum.