Zinc, titanium, iron, and aluminum are all ingredients found in inorganic sunscreens. Which of the following choices correctly lists the atoms in order of increasing atomic radius?A.Al < Zn < Fe < TiB.Zn < Fe < Ti < AlC.Ti < Fe < Zn < AlD.Al < Ti < Fe < ZnSubmit
Question
Zinc, titanium, iron, and aluminum are all ingredients found in inorganic sunscreens. Which of the following choices correctly lists the atoms in order of increasing atomic radius?A.Al < Zn < Fe < TiB.Zn < Fe < Ti < AlC.Ti < Fe < Zn < AlD.Al < Ti < Fe < ZnSubmit
Solution
The atomic radius generally increases as you move down a group (column) in the periodic table and decreases as you move across a period (row).
Looking at the periodic table, we can see that Aluminum (Al) is in period 3, Zinc (Zn) and Titanium (Ti) are in period 4, and Iron (Fe) is in period 4 as well.
However, within the same period, the atomic radius decreases from left to right. So, Titanium (Ti) has a larger atomic radius than Zinc (Zn) and Iron (Fe).
Therefore, the correct order from smallest to largest atomic radius is: Al < Zn < Fe < Ti.
So, the correct answer is A. Al < Zn < Fe < Ti.
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