Which of the following elements has the small | vedclass

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(A) The atomic radius decreases as we move from left to right across a period due to an increase in effective nuclear charge $(Z_{eff})$.$K$ (Potassiu

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$K$

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(A) The atomic radius decreases as we move from left to right across a period due to an increase in effective nuclear charge $(Z_{eff})$.$K$ (Potassium) is in Group $1$,Period $4$.$Sr$ (Strontium) is in Group $2$,Period $5$.$Rb$ (Rubidium) is in Group $1$,Period $5$.$Ba$ (Barium) is in Group $2$,Period $6$.Comparing these,$K$ has the smallest atomic radius because it is in the $4^{th}$ period,while the others are in the $5^{th}$ or $6^{th}$ periods. As we move down a group,the number of shells increases,leading to a larger atomic size.

Which of the following elements has the smallest size?

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