Which of the following is the correct order of elements in increasing atomic radius: K, Mg, B?

Name: Which of the following is the correct order of elements in increasing atomic radius: K, Mg, B?
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Question

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Atomic radius increases as you move down a group and decreases as you move across a period from left to right. B (Boron) is to the left of Mg (Magnesium) in the same period, and K (Potassium) is below Mg in the same group, making K the largest and B the smallest in atomic radius.

Which of the Following Is the Correct Order of Elements