41. . . . . . . . . is the only non-metal present in group 1 of the modern periodic table?
42. Which one of the following properties changes with valency?
43. Which group of Periodic Table contains no metal?
44. In a group, the number of valence electrons . . . . . . . .
45. In the periodic table, aluminium is related to the diagonal . . . . . . . .?
46. From the given options, fill in the blanks using the correct option for the following statement . . . . . . . . the element has the greatest tendency to lose electrons.
47. Which is the only non-metal present on the left in the modern periodic table?
48. O, S and Se what is the correct sequence of atomic sizes of these elements?
49. Where are metals placed in the modern periodic table?
50. Are the minimum reactive elements of the periodic table.
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