* Atomic Number: The atomic number of an element defines the number of protons in its nucleus. Lead (Pb) has an atomic number of 82. This means it has 82 protons.
* Mass Number: The mass number represents the total number of protons and neutrons in the nucleus. Since the atomic mass is 206, we know:
* Protons + Neutrons = 206
* Calculating Neutrons: To find the number of neutrons, subtract the number of protons from the mass number:
* Neutrons = 206 - 82 = 124
Therefore, a lead (Pb) nucleus with an atomic mass of 206 has 82 protons and 124 neutrons.
