Which of the following will have a larger radius than Zinc? Strontium Gallium Aluminum

## Step 1<br />The problem involves understanding the periodic table and the concept of atomic radius. The atomic radius of an element is the size of its atoms, usually measured by the distance from the nucleus to the boundary of the surrounding electron cloud. The atomic radius tends to increase down a group (column) and decrease across a period (row).<br /><br />## Step 2<br />Zinc (Zn) is located in the fourth period and the 12th group of the periodic table. <br /><br />## Step 3<br />Strontium (Sr) is located in the fifth period and the same 2nd group as Zinc. According to the trend, Strontium should have a larger atomic radius than Zinc because it is located below Zinc in the periodic table.<br /><br />## Step 4<br />Gallium (Ga) is located in the fourth period and the 13th group, which is to the right of Zinc. According to the trend, Gallium should have a smaller atomic radius than Zinc because it is located to the right of Zinc in the same period.<br /><br />## Step 5<br />Aluminum (Al) is located in the third period and the 13th group, which is above and to the left of Zinc. According to the trend, Aluminum should have a smaller atomic radius than Zinc because it is located above Zinc in the same group.