What is the molar mass of the isotope lead-208 (#208Pb#)? Chemistry Matter Isotopes 1 Answer anor277 Jul 20, 2016 #208*g*mol^-1# Explanation: The isotopic notation #""^(208)Pb# specifies the number of neutrons and protons, i.e. massive nuclear particles. Of course, we know #Z#, the number of nuclear protons, or we would know if we looked up the atomic number of #Pb#. This is your job. Answer link Related questions How would you find the atomic number, atomic mass, protons, neutrons and electrons for ions and... Question #f36d4 How are isotopes of elements formed? What radioactive isotopes are naturally occurring? How do isotopes of carbon differ from one another? Strontium consists of four isotopes with masses of 84 (abundance 0.50%), 86 (abundance of 9.9%),... Why are the isotopes of an element chemically similar? Naturally occurring europium (Eu) consists of two isotopes with a mass of 151 and 153. 151/63 Eu... Oxygen is composed of three isotopes 16/8 O (15.995 u), 17/8 O (16.999 u) and 18/8 O (17.999 u).... Copper is listed on the periodic table as having a relative atomic mass of 63.55. Reference... See all questions in Isotopes Impact of this question 5881 views around the world You can reuse this answer Creative Commons License