81. Which of the following classifications is based on atomic numbers?
82. . . . . . . . . is the free energy, when an electron, is added to its neutral gaseous atom.
83. In the modern periodic table, where is the element of electronic configuration 2, 8, 1 placed?
84. In the modern periodic table, the periods . . . . . . . . contains lanthanides and actinides.
85. The ionization potential of nitrogen is higher than that of oxygen due to . . . . . . . .
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