81. In the modern periodic table, which period has 32 elements?
82. Arrange the following elements in order of their increasing nonmetal properties: Li, O, C, Be, F
83. In which groups elements of d-block are found?
84. In Mendeleev's periodic table, in what order were the elements arranged?
85. Which of the following is true regarding metals?
86. The sixth period of the modern periodic table contains the . . . . . . . . element?
87. The atomic radius of potassium is . . . . . . . . Sodium.
88. Elements of group 1 are called . . . . . . . .?
89. In . . . . . . . . the valence electrons of elements increase when moving from one side to the other?
90. Which of the following element has maximum density?
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