61. The modern periodic table was discovered by
62. Electronegativity when moving from fluorine to chlorine, bromine and then iodine-
63. Atomic number of actinides . . . . . . . . is?
64. Mendeleev's Periodic Table in . . . . . . . . was published in a German magazine.
65. The elements A, B, C, D and E, whose atomic numbers are 2, 3, 7, 10 and 30 respectively, belong to the same period.
66. In the modern periodic table, . . . . . . . . and . . . . . . . . each of the periods has two metalloids-
67. Match List I with List II.
List-I
List-II
a. Recently named by IUPAC
1. Fe
b. Variable valency
2. Ds
c. Maximum electronegativity
3. Cl
d. Maximum electron affinity
4. F
| List-I | List-II |
| a. Recently named by IUPAC | 1. Fe |
| b. Variable valency | 2. Ds |
| c. Maximum electronegativity | 3. Cl |
| d. Maximum electron affinity | 4. F |
68. Which of the given statements is/are correct?
1. The elements of the second group are called alkali metals.
2. The elements of the first group are called alkaline soil metals.
3. Elements of the 17th group are called halogen.
1. The elements of the second group are called alkali metals.
2. The elements of the first group are called alkaline soil metals.
3. Elements of the 17th group are called halogen.
69. Where would you find the element of electronic configuration 2, 8, 3 in the modern periodic table?
70. What is the first element of group 17 in the modern periodic table?
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