Na, Mg and Al are the elements of the `3^(rd)` period of the Modern Periodic Table having group number 1, 2 and 13 respectively . Which one of these has the (a) highest valency (b) largest atomic radius, and (c ) maximum chemical reactivity? Justify your answer stating the reason for each.

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 maximum chemical reactivity ?

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 highest valency, Justify your answer stating the reason for each.

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.

F, Cl and Br are elements each having seven valence electrons. Which of these: (i) has the largest atomic radius (ii) is most reactive? Justify your answer stating reason for each.

The elements Li, Na and K, each having one valence electron, are in period 2, 3 and 4 respectively of modern periodic table. (a) In which group of the periodic table should they be ? (b) Which one of them is least reactive ? (c) Which one of them has the largest atomic radius ? Give reason to justify your answer in each case.

In the Modern Periodic Table, which group has a completely filled valence shell and chemically inactive elements?