Why transition metals form interstitial compounds

The same question, asked 2 times: 17 Apr 2026 S1, 15 May 2026 S2. Every wording below, oldest first.

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Question 1
17 Apr 2026 S1
34 $Why transition elements have more tendency to form interstitial compounds?$
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Question 2
15 May 2026 S2
32 $Which of the following is responsible for forming Interstitial compounds?$
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