82
Lead has 82 protons in its nucleus. This is represented by its atomic number, which is 82 on the periodic table. The presence of these protons determines lead's chemical properties and its identity as an element.
There are 13 protons in the nuclei of aluminum.
42
Phosphorus has 15 protons in its nucleus.
82
15 (Its atomic number)
Lead or Pb ALWAYS has 82 protons.
Pb, Lead, has 82 protons.
Very large nuclei have more protons, which increases the electromagnetic repulsion among them, making the nucleus less stable. Additionally, for very large nuclei, the strong nuclear force may not be strong enough to overcome the repulsive forces, leading to instability. Lastly, large nuclei may have too many neutrons, which can lead to instability due to the imbalance in the ratio of protons to neutrons.
The band of stability graph shows that there is an optimal ratio of protons to neutrons in atomic nuclei for stability. Nuclei with too few or too many neutrons compared to protons are less stable and tend to undergo radioactive decay.
The element with 14 protons in the nuclei of its atoms is silicon, with the atomic number 14.
Protons are normally found in the nuclei of atoms.