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63. 92 X A He 238 o 2 4 । तत्व Aमें न्यूट्रॉनों की संख्या होगी :"

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<sup>63. 92</sup> X A He <sup>238</sup> o <sup>2</sup> <sup>4</sup> । तत्व Aमें न्यूट्रॉनों की संख्या होगी :"






 
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