Chapter 4

🥈 Row 5: rubidium to xenon

The fifth row runs from rubidium to xenon. It holds silver, the best conductor of electricity, tin, which gave the Bronze Age its metal, and iodine, added to salt for a healthy thyroid. It also holds technetium, the first element ever made by people, and several elements named after places: yttrium after a Swedish village, ruthenium after Russia and tellurium after the Earth itself. In its middle sit metals that clean car exhaust.

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