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Place the following elements in order of decreasing atomic radius:

A. Sr, Zr, Xe
B. Xe, Sr, Zr
C. Zr, Xe, Sr
D. Xe, Zr, Sr

Answer :

Final answer:

The correct order of the elements in terms of decreasing atomic radius is Sr, Zr, Xe. This order is determined by the locations of the elements on the periodic table and the trend in atomic size, which decreases across a period from left to right.

Explanation:

The question is asking to arrange the given elements, which are Zirconium (Zr), Strontium (Sr), and Xenon (Xe), in order of decreasing atomic radius. The atomic radius of an element refers to the size of its atoms. As per the trends in the periodic table, atomic radius decreases as we move across a period from left to right, and it increases as we move down a group.

Here, Sr, Zr, and Xe are from the same period 5 of the periodic table. Zr and Sr belong to groups 4 and 2 respectively, while Xe is a noble gas found on the far right of the table. Remembering the general trend in atomic size helps determine the order: Strontium (Sr) being in group 2 has the largest atomic radius, followed by Zirconium (Zr) in group 4, and Xenon (Xe) is at the end of the period with the smallest atomic radius.

So, the correct order of these elements in terms of decreasing atomic size is Sr, Zr, Xe, which corresponds to option a).

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