51. What is the first metallie element in the modern periodic table?
52. What is Mendeleev's recurrent law based on?
53. In the modern periodic table, there are only gases are presetn in the . . . . . . . . period.
54. In Mendeleev's periodic table, . . . . . . . . before the nickel?
55. The alkali metals have relatively low melting point.Which one of the following alkali metals is expected to have the highest melting point?
56. To remove one electron from the outermost orbit or the shell of the neutral gaseous atom . . . . . . . . is needed.
57. The ionization energy of an element depends on the . . . . . . . .
58. Who classified elements based on atomic numbers?
59. In which of the following groups of modern periodic table, noble gases are placed?
60. Elements . . . . . . . . were placed in the periodic table of Newland with halogens.
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