Question: a. List the noble gas elements. Which of the noble gases has only radioactive isotopes? (This situation is indicated on most periodic tables by parentheses

a. List the noble gas elements. Which of the noble gases has only radioactive isotopes? (This situation is indicated on most periodic tables by parentheses around the mass of the element. See inside front cover.)
b. Which lanthanide element and which transition element have only radioactive isotopes?

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a The noble gases are He Ne Ar Kr Xe and Rn helium neon ... View full answer

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