Teaching Bihar STET Paper 1 (माध्यमिक) Mock Test 2024 Chemistry

निम्नलिखित में से कौन-सा समुच्‍चय समइलेक्‍ट्रॉनी है?

1
Li, Na, K
2
S-2, Cl-1, Ar
3
Ar, K+, Ca+ 
4
Ne, Na+, F
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