Periodic Classification of Elements
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See all →- Compare and contrast the arrangement of elements in Mendeleev's Periodic Table and the Modern Periodic Table. Mendeleev's periodic table Modern periodic table Elements are arranged in the increasing order of their atomic masses. Elements are arranged... 1
- In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers The element with atomic number 12 has same chemical properties as that of calcium. This is because both of them have same number of valence... 2
- How does the electronic configuration of an atom relate to its position in the Modern Periodic Table? In the modern periodic table, atoms with similar electronic configurations are placed in the same column. In a group, the number of valence... 1
- Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Nitrogen (7): 2, 5 Phosphorus (15): 2, 8, 5 Since, electronegativity decreases with moving from top to bottom in a group, thus Nitrogen will... 1
- The position of three elements A, B and C in the Periodic Table are shown below - Group 16 Group 17 (a) A is a non-metal. (b) C is less reactive than A, as reactivity decreases down the group in halogens. (c) C will be smaller in size than... 1
- An atom has electronic configuration 2, 8, 7. (a) What is the atomic number of this element? (a) The atomic number of this element is 17. (b) It would be chemically similar to F(9) with configuration as 2, 7. 1