81. The first and third members of the Dobereiner triad are phosphorus and antimony, the second member of this triad is-
82. Identify the element that does not belong to the following group.
83. Which element has the highest electron affinity in halogens?
84. Which of the following is the minimum electronegative element?
85. The reactivity of non-metals within a group in the Periodic Table
86. Match List I and List II.
List-I
List-II
a. Elements in group I A
1. Inert gas
b. Elements in group zero
2. Alkali metal
c. Elements of d-block
3. Inner-transiti on element
d. Elements of f-block
4. Transition element
| List-I | List-II |
| a. Elements in group I A | 1. Inert gas |
| b. Elements in group zero | 2. Alkali metal |
| c. Elements of d-block | 3. Inner-transiti on element |
| d. Elements of f-block | 4. Transition element |
87. The fourth and fifth period has-
88. Select the Element which does not belong to the following group:
89. What are the vertical columns present in the modern periodic table?
90. What does the term periodicity mean?
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