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Which stable (nonvariable) gas in the atmosphere is derived from the radioactive decay of potassium-40 (40K)?

A) Radon
B) Krypton
C) Xenon
D) Argon

1 Answer

3 votes

Final answer:

The stable gas derived from the radioactive decay of potassium-40 (40K) is argon.

Step-by-step explanation:

The stable gas derived from the radioactive decay of potassium-40 (40K) is argon (option D).

Potassium-40 (40K) undergoes beta decay to form calcium-40 (40Ca) and releases an electron and an electron antineutrino. The resulting calcium-40 then undergoes gamma decay into its ground state.

Argon is a noble gas that is nonreactive and stable. It is present in the atmosphere and is mainly produced by the radioactive decay of potassium-40 (40K) in rocks and minerals.

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