Many subatomic nuclear particles are --- and nearly ---: they are hard to track as well as to detect.

Unstable .. explosive

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Elusive .. imperceptible

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Minute .. immobile

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Charged .. reactive

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Tenuous .. indivisible

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Solution

The correct option is D Elusive .. imperceptible
Subatomic particles are hard to track means that they are 'elusive'. Even if they are charged you can only detect them - electrons. And in u stable state - uranium.
Hard to detect means imperceptible. Explosive items are very easy to detect and indivicible can still be detected.
The correct answer is option B.

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