Nuclear Stability Facts
The greater the number of protons, the more neutrons are needed
“Magic numbers” of protons or neutrons which are unusually stable
- 2, 8, 20, 28, 50, 82, 126
- Sn (Z=50) has 10 isotopes; In (Z=49)& Sb (Z=51) have only 2
- Pb-208 has a double magic number (126n, 82p) & is very stable