Final answer:
The elements magnesium (Mg), calcium (Ca), strontium (Sr), and barium (Ba) ordered from smallest to largest atomic radius are: Mg, Ca, Sr, Ba. This is because the atomic radius increases as we go down a group in the Periodic Table; more energy levels are added which increases the atomic radius.
Explanation:
The question is asking for the atoms of magnesium (Mg), barium (Ba), strontium (Sr), and calcium (Ca) to be ordered from smallest to largest atomic radius.
In general, the atomic radius increases as we move down a group in the periodic table because additional energy levels are being added. Therefore, if we follow this trend, the order from smallest to largest atomic radius for these elements would be: Mg, Ca, Sr, Ba.
This is because all these elements lay in the same group (Group 2 - Alkaline Earth Metals) of the Periodic Table. As we go down this group, the number of energy levels increases which in turn increases the atomic radius. Thus, magnesium (Mg) has the smallest atomic radius and barium (Ba) has the largest.
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