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Q:

परमाणु क्रमांक ’20’ वाले परमाणु का इलेक्ट्रॉनिक विन्यास है:

  • 1
    2, 8, 10
  • 2
    2, 6, 8, 4
  • 3
    2, 8, 8, 2
  • 4
    2, 10, 8
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Answer : 3. "2, 8, 8, 2"

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