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Which of the following is iso-electronic with neon-

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Which of the following is iso-electronic with neon-
A. `O^(2-)`
B. `F^(+)`
C. `Mg`
D. `Na`
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Correct Answer - A
`R=R_(0)A^(1//3)=1.33xx10^(-13)xx(64)^(1//3)cm`
`=5.32xx10^(-13)xx(64)^(1//3)cm`
`because 1fm = 10^(-15)m~~5fm`
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