Periodic Classification of elements
- 2. 2 Devang S.P SIngh XI A B.N.G International School
- 3. Law of triads:- According to law of triads elements were placed in a group of 3 and they were called triads. These were placed in the increasing order of atomic masses
- 4. Newland’s law of octaves:- The elements were placed in increasing order of their atomic weights and it was noted that every eighth element had properties similar to the first element .
- 5. Mendeleev’s periodic law “The properties of the elements are a periodic function of their atomic weights.”
- 7. Modern periodic law “The chemical and physical properties of elements are a periodic function of their atomic numbers”. Henry Moseley
- 9. Different Blocks in periodic table Periodic Table is divided into 4 block .
- 10. S Block Elements in which the last electron enters the s-orbital of the outermost energy level are called s-block elements. The s-block consists of two groups—Group 1 and Group 2, which are alkali metals and alkaline earth metals.
- 11. P Block Elements in which the last electron enters the p-orbital of their outermost energy level are called p- block elements. The p-block elements comprise elements belonging to Groups 13−18. It consists of all types of elements— metals, non-metals and metalloids.
- 12. D Block •Elements in which the last electron enters any one of the five d-orbitals of penultimate shells are called d-block elements. •Elements of Groups 3−12 in the center of the periodic table constitute the d-block elements. •The general outer electronic configuration of d-block elements is (n − 1)d1−10 ns1−2.
- 13. F Block •Elements in which the last electron enters any one of the seven f-orbitals of their respective ante-penultimate shells are called f-block elements. •There are 28 f-block elements in the periodic table which are placed at the bottom of the periodic table
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