31. Between the chemical properties, Mendeleev focused on compounds made with these elements.
32. Which group in the modern periodic table includes elements that are inert gases?
33. In the modern periodic table, in which period elements of atomic numbers 11 to 14 are placed:
34. In the third period of the periodic table, the smallest element is . . . . . . . .?
35. In the modern periodic table, bromine Occurs in the . . . . . . . . period.
36. Which of the following atomic number elements have chemical properties similar to magnesium?
37. What are the 14 elements after Actinium called?
38. The atomic numbers of the four basic elements of a period are 11, 13, 16 and 17. In the modern periodic table, atomic number of the most metallic element of these will be . . . . . . . .
39. Name the German chemist who grouped elements into triads in 1817.
40. The element with atomic number 57 belongs to-
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