Question

The element with the largest atomic size from the elements of period$-1,2$and $3$ is:

• A. $Li$
• B. $Na$
• C. $F$
• D. $Cl$

Answer 1

The correct option is B $Na$

The atomic radius of an element is half of the distance between the centers of two atoms of that element that are just touching each other. Generally, the atomic radius decreases across a period from left to right and increases down a given group. The atoms with the largest atomic radii are located in Group I and at the bottom of groups.