Which of the following species is the smalles | vedclass

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(A) To determine the size,we compare the atomic/ionic radii of the given species:$1$. $Li^+$ ($Z=3$,$2$ electrons): It is a cation with a $1s^2$ confi

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Lithium ion $(Li^+)$

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(A) To determine the size,we compare the atomic/ionic radii of the given species:$1$. $Li^+$ ($Z=3$,$2$ electrons): It is a cation with a $1s^2$ configuration. The removal of an electron leads to a decrease in the number of shells and increased effective nuclear charge,making it very small.$2$. $H$ ($Z=1$,$1$ electron): It has a $1s^1$ configuration.$3$. $Li$ ($Z=3$,$3$ electrons): It has a $1s^2 2s^1$ configuration.$4$. $He$ ($Z=2$,$2$ electrons): It has a $1s^2$ configuration.Comparing these,$Li^+$ has the smallest radius because it has lost its valence shell and has a high effective nuclear charge relative to the number of electrons. The order of size is $Li^+ < He < H < Li$.

Which of the following species is the smallest in size?

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