Which is the most stable nucleus among these?

Options

A. `._(2)He^(3)`
B. `._(11)Na^(24)`
C. `._(83)Bi^(210)`
D. `._(82)Pb^(207)`

Answer

d

Explanation

`n//p` ratio for `._(2)He^(3) = (1)/(2) = 0.5 (lt1)`
`n//p` ratio for `._(11)Na^(24) = (13)/(11) = 1.19` (greater than that of stable isotope `._(11)Na^(23)`)
`n//p` ratio for `._(83)Bi^(210) = (127)/(83) = 1.54 (gt 1.53)`
`n//p` ratio for `._(82)Pb^(207) = (125)/(82) = 1.53`
Hence, `._(82)Pb^(207)` is the most stable as its`n//p` ratio lies between the stability range, i.e., (1.00 - 1.53).