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एक परमाणु का इलेक्ट्रॉनिक विन्यास `1s^(2(), 2s^(2) 2p^(6), 3s^(2) 3p^(6) 3d^(10), 4s^(2) 4p^(5)` तथा परमाणु भार 80 है । इसका परमाणु क्रमांक तथा इसके नाभिक में न्यूट्रॉनों की संख्या है :
A. 35 और 45
B. 45 और 35
C. 40 और 40
D. 30 और 50

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`._(35) Br ^(80) = 1s^(2) , 2s^(2) 2p^(6)3s^(2) 3p^(6)3d^(10), 4s^(2) 4p^(5)`
`A = 80 , Z = 25 , n = ?`
` n = A-Z= 80 - 35 = 45 `
प्रोटॉन ( परमाणु संख्या ) तथा 45 न्यूट्रॉन हैं ।

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