Physics · Radioactivity and Naturally Occurring Elements

Which pair of major primordial radioactive elements is naturally present in significant quantities in Earth's crust?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1Radium and Polonium
2Plutonium and Neptunium
3Uranium and Thorium✓
4Technetium and Promethium

Correct answer

Uranium and Thorium

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Which pair of major primordial radioactive elements is naturally present in significant quantities in Earth's crust?

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Which pair of major primordial radioactive elements is naturally present in significant quantities in Earth's crust?

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