1.

The atomic mass and atomic number of lead are 208 and 82. The atomic mass and atomic number of bismuth are 209 and 83. The `"neutron"//"proton"` ratio in an atomA. Is higher in lead than in bismuthB. Is lower in lead than in bismuthC. Is equal in both lead and bismuthD. None of these

Answer» Correct Answer - D
`._(82)Pb^(208), p = 82, n = 208 - 82 = 126`
`._(83)Bi^(209), p = 83, n = 209 - 83 = 126`
`n//p` for `Pb = (126)/(82) = 1.53`
`n//p` for `Bi = (126)/(83) = 1.51`
`:. (n)/(p)` for `Pb gt (n)/(P)` for `Bi`


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