Potential answers for "Two-element tubes"

⭐⭐⭐⭐ DIODES
⭐⭐⭐ YTTRIUM
⭐⭐⭐ ARGON
⭐ PLUTONIUM
⭐ ADA
⭐ POTASSIUM
⭐ NEON
⭐ AIRWAVE
⭐ LEAD
⭐ OPPOSITEMEANING

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