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Answer :
Final answer:
The elements Sr, Li, and Ca are arranged in increasing atomic radius as Li < Ca < Sr, based on their positions in the periodic table and the periodic trends of atomic size. So the correct option is a) Li < Ca < Sr
Explanation:
To place the elements Sr, Li, and Ca in order of increasing atomic radius, you need to consider their positions in the periodic table. The atomic radius tends to increase as you move down a group because additional electron shells are added, making the atom larger. Additionally, atomic radius generally decreases as you move from left to right across a period due to the increasing positive charge in the nucleus which pulls the electron cloud closer. Considering these trends, lithium (Li) is in the second period and is the smallest element among the three given. Strontium (Sr) is below calcium (Ca) in the same group and therefore Sr is the largest. Thus, the correct order is Li < Ca < Sr.
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