Answer
Symbol for the isotope of Lead is written below:
Work Step by Step
Atomic number of Lead (Pb) = 82 as 'Pb' has 82 protons.
Now, here the isotope of Pb contains 128 neutrons.
So, the mass number of this isotope of Pb = 82+128 = 210.
(Mass number = no. of protons + no. of neutrons)
Now, we can write the symbol by writing the chemical symbol of the element (for example, Pb is the chemical symbol of Lead) and providing the atomic number on the left subscript of the chemical symbol and the mass number on the left superscript. See below how to write chemical symbol for an isotope.
