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কোন দুটি পরমাণু পরস্পরের আইসোবার

{}^{64}C u_{29}, {}^{64}Z n_{30}

{}^{35}C l_{17}, {}^{34}S_{16}

{}^{30}S i_{14}, {}^{31}P_{15}

{}^{1}H_{1}, {}^{2}H_{1}

ANS : 1

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