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List the following atoms in order of increasing size (atomic radius): Ba, Mg, Sr.

A. Sr < Ba
B. Ba < Sr < Mg
C. Mg < Sr < Ba
D. Mg < Ba < Sr

Answer :

Final answer:

The atomic radius of elements increases as we move down the group in the periodic table. For the given elements in group II, the order of increasing atomic radius is Magnesium (Mg) < Strontium (Sr) < Barium (Ba).

Therefore, correct answer is C.

Explanation:

The order of increasing atomic radius among the elements Magnesium (Mg), Strontium (Sr), and Barium (Ba) is influenced by their position on the periodic table. As we move down the group in periodic table, the atomic radius increases due to added energy levels. Therefore, Magnesium (Mg) being at the top of the group II elements on the periodic table, has the smallest atomic radius. Strontium (Sr) lies below Magnesium and above Barium, thus, its atomic radius is larger than Magnesium but smaller than Barium. Barium (Ba) being at the bottom of the group has the largest atomic radius. So, the correct answer is C) Mg < Sr < Ba.

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