(a) What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?(b) What is the number of elements in: (a) 1st period, and (b) 3rd period, of the modern periodic table?.Define the Periodic Table with elements name.Atomic number of a few elements are given below 10, 20, 7, 14(a) Identify the elements(b) Identify the Group number of these elements in the Periodic Table(c) Identify the Periods of these elements in the Periodic Table(d) What would be the electronic configuration for each of these elements?(e) Determine the valency of these elements.(a) What is the usual number of valence electrons and valency of group 18 elements of the periodic table?(b) What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?.(a) How does the electropositive character of elements change on going down in a group of the periodic table?(b) State how the valency of elements varies (i) in a group, and (ii) in a period, of the periodic table.In the modern periodic table, which are the metals among the first ten elements?.Compare and contrast the arrangement of elements in Mendeleev’s Periodic Table and the Modern Periodic Table.What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?.Name of 118 elements in the periodic table. How does the valency of elements change on moving from left to right in the third period of the periodic table?.How does the valency of elements vary in going down a group of the periodic table?.
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