Question

of the elements ca, be, ba, and sr, which has the largest atomic radius?

Explanation:

Step1: Recall atomic radius trend

Atomic radius increases down a group and decreases across a period.

Step2: Locate elements in periodic table

Ca (Calcium), Be (Beryllium), Ba (Barium), Sr (Strontium) are in Group 2 (alkaline earth metals). Order from top to bottom: Be, Ca, Sr, Ba.

Step3: Determine largest atomic radius

Since atomic radius increases down the group, Ba has the largest atomic radius.

Answer:

Ba