Correct answer: 5.             4 2 4 2 Be 4 He 2 h m Be U m He 4 x h 9 y m Be m He U              y – x = 5

See image | AITS & Test Series — Chem-Mantra

AITS & Test SerieshardNUMERICAL

Question

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Answer: 5

💡 Solution & Explanation

            4 2 4 2 Be 4 He 2 h m Be U m He 4 x h 9 y m Be m He U              y – x = 5

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