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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.

The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7 electrons respectively in their outermost shells. Write the group numbers in which these elements are placed in the Modern Periodic Table. Write the electronic configuration of the atoms of B and D and the molecular formula of the compound formed when B and D combine.

What is the group number of the modern periodic table in which zirconium belongs (atomic number of Zr- 40) (In the scale of Group Number 1 - 18)

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 largest atomic radius, Justify your answer stating the reason for each.