61. Which of the following types of elements show variable valency?
62. Californium is a member of the . . . . . . . . group.
63. How does the metallic property of an element change in the modern periodic table?
64. The rule of octaves was applicable only till . . . . . . . .
65. When the elements are arranged in increasing order of atomic weights, the atomic weight of the middle element is approximately the average of the atomic weights of the other two elements' - this rule is known as-
66. Which groups of the modern periodic table consists of a full-covering valence electron and chemically inert elements?
67. Which of the following always increase while moving from top to bottom in a group?
68. The Law of Triad was given by
69. Name the Noble gas placed in the third period and eighteen group of modern periodic table-
70. . . . . . . . . is not an actinoid?
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