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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.

Group $16$	Group $17$
-	-
-	$A$
-	-
$B$	$C$

Which among the following elements has the largest atomic radii?

Similar Questions

The position of three elements $A$, $B$, and $C$ in the Periodic Table are shown below:
Group $16$ Group $17$
- -
- $A$
- -
$B$ $C$

$(a)$ State whether $A$ is a metal or non-metal.
$(b)$ State whether $C$ is more reactive or less reactive than $A$.

Which of the following elements would lose an electron easily?

The order of increasing atomic size is:

Write true or false for the statement: Metallic character decreases across a period and increases down a group because the effective nuclear charge acting on the valence shell electrons increases across a period and decreases down the group.

By considering their position in the Periodic Table,which one of the following elements would you expect to have maximum metallic characteristic?
$Ga$,$Ge$,$As$,$Se$,$Be$

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