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Which one of the following indicates the...

Which one of the following indicates the correct order of atomic size?
(1). `C gt F gt Ne" "(2) Be lt C lt F lt Ne`
`(3). Be gt C gt F" "(4) F gt Ne gt Be gt C`

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The correct Answer is:
3
Be, C and F are the elements of same period (2nd period) hence, `Be gt C gt F.` But Ne is an inert gas, whose Van der Waals radii is exceptionally high, hence, `Ne gt Be gt C gt F`
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