31. Which element has the highest melting point and boiling point?
32. Which among the following has similar ionic charge to size ratio?
33. Which of the following inert gas is kept in period 4 of the periodic table?
34. Out of the four blocks in which periodic table is divided, helium belongs which block?
35. Which among the following has lowest electron affinity?
36. Lanthanides and actinides are also called . . . . . . . .
37. Hydrogen and helium Is placed in . . . . . . . .
38. Which group in the periodic table is also known as zero group (group 0)?
39. What did Dobereiner identify and name a group of three elements?
40. Fill in the blank with the correct option: "The properties of elements are the periodic functions of their atomic masses". This is the statement of . . . . . . . .
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