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एक परमाणु में 17 इलेक्ट्रान है । इसकी द्रव्यमान संख्या 35 है । इस परमाणु क्रमांक और नाभिक में एलेक्ट्रोनो की संख्या ज्ञात कीजिये ।

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परमाणु में एलेक्ट्रोनो की कुल संख्या = परमाणु का परमाणु (Z ) = 17
A= Z+n
Z= 17, A = 35
`:. `n = 35 - 17 = 18 ( न्युट्रोनो की संख्या )

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