elements in sixth period ?
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It all starts with:
- Caesium
- Barium
- Lanthanoids ( Lanthanum -> Lutetium)
- Hafnium
- Tantalum
- Tungsten
- Rhenium
- Osmium
- Iridium
- Platinum
- Gold
- Mercury
- Thallium
- Lead
- Bismuth
- Polonium
- Astatine
- Radon
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