structure

Structure

**6 energy levels** **first energy level:** 2 **second energy level:** 8 **third energy level:** 18 **fourth energy level:** 32 **fifth energy level:** 18 **sixth energy level:** 4

Atomic number: 82 Atomic mass: 207.2 amu Melting point: 327.5 °C Boiling point: 1740.0 °C Number of protons/electrons: 82 Number of neutrons: 125