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जिस तत्व के परमाणु में दो प्रोटॉन‚ दो न्यूट्रॉन और दो इलेक्ट्रान हों‚ उस तत्व का द्रव्यमान संख्या कितना होता है?

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जिस तत्व के परमाणु में दो प्रोटॉन‚ दो न्यूट्रॉन और दो इलेक्ट्रान हों‚ उस तत्व का द्रव्यमान संख्या कितना होता है?






 
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