ASK DR. KNOWLEDGE

From: The Boston Globe | Date: October 24, 2005 | Copyright information

I am a fan of Tom Lehrer's song about the periodic table. He counts off all the elements in the periodic table but finishes off with a somewhat cryptic comment about elements that haven't been discovered yet. Are all the elements actually discovered? Do they exist in nature?

RG, Boston

Here's the story: Different chemical elements are distinguished by the number of protons they have in their nuclei. Protons all carry positive electrical charges and repel each other, so to help th...

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