Question

rank the following elements by increasing atomic radius. enter the numbers 1 - 3 in the blank boxes to show your ranking. enter 1 for the element with the smallest atomic radius and 3 for the element with the largest atomic radius. aluminum, al chlorine, cl potassium, k

Explanation:

Step1: Recall atomic - radius trend

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

Step2: Locate elements in periodic table

Potassium (K) is in Group 1 and Period 4. Aluminium (Al) is in Group 13 and Period 3. Chlorine (Cl) is in Group 17 and Period 3.

Step3: Compare atomic radii

Since K is in a lower period than Al and Cl, K has the largest atomic radius. Among Al and Cl which are in the same period, Cl has a smaller atomic radius than Al as atomic radius decreases across a period. So the order of increasing atomic radius is Cl < Al < K.

Answer:

1. Chlorine, Cl
2. Aluminium, Al
3. Potassium, K