Cbse Class 10 Easy Notes

  Periodic Classification of Elements Class 10 Notes Early Models of Periodic Table Dobereiner’s Triads Dobereiner arranged a group of three elements with similar properties in the order of increasing atomic masses and called it a triad. He showed that the atomic mass of the middle element is approximately the arithmetic mean of the other two. But, Dobereiner could identify only the following three triads from the elements known at that time. Newlands’ Law of Octaves sa (do) re (re) ga (mi)  ma (fa)  pa (so)  da (la) ni (ti) H Li Be B C  N  O F Na Mg Al Si  P  F Cl K Ca Cr Ti Mn Fe Co and Ni Cu Zn Y  In  As Se Br Rb Sr Ce and La Zr  ______ _____ When the elements are arranged according to increasing atomic masses, the physical and chemical properties of every eighth element are similar to that of the first. Newlands compared these octaves to the series of eight notes of a musical scale. Assumptions and Limitations: 1. The law was applicable for elements with atomic masses up to 40. 2.

      CBSE Class 10 Science Notes                 Chapter 4     Carbon and its Compounds: 

      CBSE Class 10 Science Notes                  Chapter 3          Metals And Non Metals:

           Class 10  Science Notes                    Chapter 7       Control and Coordination:

      CBSE Class 10 Science Notes                         Chapter 2             Acids Bases And Salts:

               CBSE Class 10 Science                          Chapter 10 Light Reflection and Refraction Notes: 

                                Class 10 Science                       Chapter 6 Life Processes  Introduction Life Earth happens to be the only known planet having a life. There are beings wh0 live, die and become part of nature again. The living organism can be differentiated from the inanimate entities on various parameters of life processes. Life Process Maintenance of living organism is essential even if they are moving, resting or even sleeping. The processes which together perform the function of maintenance of ‘life’ are called as life processes. Nutrition, respiration, circulation, excretion are examples of essential life processes. In unicellular organisms, all these processes are carried out by that single cell. In multicellular organisms, well-developed systems are present to carry out the processes. Nutrition Nutrition The process of acquiring food that is needed for nourishment and sustenance of the organism is called nutrition. There are two main modes of nutrition, autot