The correct order of increasing atomic radius | vedclass

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(B) To determine the order of atomic radii,we look at the positions of the elements in the periodic table: $1$. $O$ (Oxygen) and $C$ (Carbon) are in t

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$O < C < S < Se$

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(B) To determine the order of atomic radii,we look at the positions of the elements in the periodic table: $1$. $O$ (Oxygen) and $C$ (Carbon) are in the $2^{nd}$ period. In a period,atomic radius decreases from left to right. Thus,$C > O$. $2$. $S$ (Sulfur) and $Se$ (Selenium) are in the $3^{rd}$ and $4^{th}$ periods respectively. Atomic radius increases down a group. Thus,$Se > S$. $3$. Comparing periods: Elements in the $2^{nd}$ period $(C, O)$ have smaller atomic radii than those in the $3^{rd}$ and $4^{th}$ periods $(S, Se)$. $4$. Combining these: $O Therefore,the correct order of increasing atomic radius is $O < C < S < Se$.

The correct order of increasing atomic radius of the following elements is

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