TN Police Constable Exam 2019 Solved Paper

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Question : 18 of 80

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Which of the following pairs is an example of isotones.

₆C¹³, ₇N¹⁴
₁₇Cl³⁵, ₁₇Cl³⁷
₁₈Ar⁴⁰, ₂₀Ca⁴⁰
₁D², ₁T³

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