Question

1. rank the following elements by decreasing atomic radius: antimony, indium, xenon, zirconium xenon,antimony,indium,zirconium.

Explanation:

Step1: Recall atomic - radius trend

Atomic radius decreases across a period and increases down a group in the periodic table. Zirconium (Zr) is in Group 4 and Period 5, indium (In) is in Group 13 and Period 5, antimony (Sb) is in Group 15 and Period 5, and xenon (Xe) is in Group 18 and Period 5.

Step2: Apply the trend

Since they are in the same period, the atomic radius decreases as the atomic number increases. The atomic numbers of Zr = 40, In = 49, Sb = 51, Xe = 54. So the order of decreasing atomic radius is Zirconium > Indium > Antimony > Xenon.

Answer:

Zirconium, Indium, Antimony, Xenon