It’s the first one
Comencé
What do you need help with? I'm in spanish 1 right now, so i may or may not be able to help you
Answer:
Symbol: Pb
Atomic mass: 207.2 u
Atomic number: 82
Melting point: 621.5°F (327.5°C)
Electron configuration: [Xe] 4f¹⁴5d¹⁰6s²6p²
Electrons per shell: 2,8,18,32,18,4
Boiling point: 3,180°F (1,749°C)
Explanation:
hope this helps :)
