The atom of an element has electronic configuration \( 2,8,1 \). Which of the following elements...

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The atom of an element has electronic configuration \( 2,8,1 \). Which of the following elements is similar with it in chemical reactivity?
a. \( \mathrm{K} \)
b. \( \mathrm{Cl} \)
c. Al
d. \( \mathrm{Ar} \)
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