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यूरेनियम की द्रव्यमान-संख्या 235 और परमाणु क्रमांक 92 है। यूरेनियम परमाणु में प्रोटॉन, न्यूट्रॉन और इलेक्ट्रॉन की संख्या होगी क्रमशः

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परमाणु क्रमांक Z = 92, द्रव्यमान संख्या A = 235
`A=Z+N`
`:." "N=A-Z`
`=235-92=143`
अत: न्यूट्रॉनों की संख्या = 143.
प्रोटॉनों की संख्या = इलेक्ट्रॉनों की संख्या
= परमाणु क्रमांक Z = 92.

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