91. In the modern periodic table, period . . . . . . . . and . . . . . . . . does not contain any metalloids.
92. How many elements were known when Mendeleev began his work?
93. The element with the highest first ionization potential is . . . . . . . .
94. What do Lithium, Sodium and Potassium have in common?
95. Which of the following elements was the last element in Newland's law of octaves?
96. The element of the lanthanide sereis with atomic number 58 is . . . . . . . .
97. In the modern periodic table, which two periods have 8 elements each?
98. How many groups and periods exist in the modern Periodic table?
99. What are the elements of group -1 of the modern periodic table?
100. What is the specialty of rare earth elements?
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