Which element has the largest atomic radius?

The figure of an incomplete periodic table is given below. Which element has the highest atomic radius ? Which one has the least ?

Which element has largest atomic radius?

From the electronic configurations Li (2, 1), Na (2, 8, 1) and K (2, 8, 8, 1), answer the following questions: Which of these elements has the largest atomic radius?

Na, Mg and Al are the elements of the 3rd period of the Modern Periodic Table having group number 1, 2 and 13 respectively. Which one of these elements has the largest atomic radius, Justify your answer stating the reason for each.

Na, Mg and Al are the elements having one, two and three valence electrons respectively. Which of these elements (i) has the largest atomic radius, (ii) is least reactive ? Justify your answer stating reason for each.

Na, Mg and Al are the elements of the same period of modern periodic table having one, two and three valence electrons respectively. Which of these elements (i) has the largest atomic radius, (ii) is least reactive ? Justify your answer stating reason for each case.

The atomic numbers of the elements Na, Mg, K and Ca are 11,12,19 and 20 respectively. The element having the largest atomic radius is: