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👉 बेरियम के कारण
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👉 अमोनियम क्लोराइड का
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👉 धातु कर्म
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👉 गैंग
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👉 न्यूलैंड ने
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👉 प्रोटॉन तथा न्यूट्रॉन
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👉 रदरफोर्ड ने
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👉 एनोड पर
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👉 1840 गुणा
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👉 एक आवेहिन कण
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