71. In the modern periodic table, which of the following periods has the highest number of non-metals?
72. Whose name is associated with the modern periodic table?
73. The classification of elements by which of the following leads to the discovery of new elements?
74. What effect is observed, on the size of an atom when an electron is removed and in another case an electron is added to the same atom?
75. In the periodic table, as one goes down the group, which property doesn't change?
76. Elements having similar outer shell electronic configuration in their atoms are arranged in
77. What is the name of that inert gas, which is placed in the first period in the modern periodic table.
78. Proposed a present modern periodic table?
79. . . . . . . . ., generally exhibit variable valency.
80. Which one among the following is the correct order of reactivity of the elements?
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