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(A) Atomic radius increases down a group due to the addition of new electron shells.Atomic radius decreases across a period from left to right due to

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$K$

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(A) Atomic radius increases down a group due to the addition of new electron shells.Atomic radius decreases across a period from left to right due to an increase in effective nuclear charge.Comparing the given elements:$Na$ (Group $1$, Period $3$)$Mg$ (Group $2$, Period $3$)$K$ (Group $1$, Period $4$)$Ca$ (Group $2$, Period $4$)Elements in Period $4$ have larger radii than those in Period $3$.Between $K$ and $Ca$, $K$ is on the left side of the periodic table, meaning it has a lower effective nuclear charge than $Ca$, resulting in a larger atomic radius.Therefore, $K$ has the largest atomic radius among the given options.

Which among the following elements has the largest atomic radii?

Similar Questions

Identify the elements with the following properties and arrange them in increasing order of their reactivity:
$(a)$ An element which is a soft and reactive metal.
$(b)$ The metal which is an important constituent of limestone.
$(c)$ The metal which exists in a liquid state at room temperature.

Why does atomic size decrease as we move from left to right along a period in the periodic table?

An element belongs to the third period and second group of the periodic table:
$(a)$ State the number of valence electrons in it.
$(b)$ Is it a metal or a non-metal?
$(c)$ Name the element.
$(d)$ Write the formula of its oxide.

Which of the following elements would form anions? Why?
$(i)$ $Na$ $(ii)$ $O$ $(iii)$ $Mg$ $(iv)$ $Al$ $(v)$ $Cl$

Explain the basic character of oxides of elements down the group and across the period.

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