21. Who designed the modern periodic table, according to which "the physical and chemical properties of elements are the periodic functions of their atomic numbers".
22. Modern Periodic Table . . . . . . . . based on:
23. . . . . . . . . the element has the lowest ionization energy?
24. Who discovered that the properties of every eighth element are the same as the first element?
25. Who invented the periodic table?
26. The following are special characteristics of a group of elements?
1. All these elements are metals
2. All these elements react with water to form hydrogen gas.
3. All these elements have a valence (1)
1. All these elements are metals
2. All these elements react with water to form hydrogen gas.
3. All these elements have a valence (1)
27. Multiplication of equivalent weight and valency of an element is equal to . . . . . . . .
28. Who is credited with classifying elements on the basis of their atomic mass?
29. Which of the following statements is true/false?
1. While moving from left to right in a period, the chemical reaction of the elements first decreases and then increases.
2. Reactivity of non metals increases when moving down the group of the periodic table.
1. While moving from left to right in a period, the chemical reaction of the elements first decreases and then increases.
2. Reactivity of non metals increases when moving down the group of the periodic table.
30. Which of the following elements could not find a definite position in Mendeleev's periodic table?
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