41. Dobereiner made the first observation of . . . . . . . . as a catalyst.
42. What is the relative tendency of an atom to attract electrons towards another element when it is bound to the atom?
43. The atomic numbers of the four elements are as follows:
F(9), P(15), Cl(17), Ar (18).
Which of the following two elements will be chemically similar?
F(9), P(15), Cl(17), Ar (18).
Which of the following two elements will be chemically similar?
44. An element of atomic number 16 is present in the periodic table . . . . . . . . period?
45. The atomic number of N is 7, then the atomic number of the third element of the nitrogen group is:
46. Very metallic element in the fifth period . . . . . . . . is?
47. In Periodic Table, metallic elements appear
48. Non-metallic properties increase-
49. The Modern Periodic Table is based on . . . . . . . . of the elements.
50. All the elements in the same group of the periodic table have same . . . . . . . .?
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