OMTEX CLASSES: 6. Write short notes: a. Mendeleev’s Periodic law.

6. Write short notes: a. Mendeleev’s Periodic law.

6. Write short notes:

a. Mendeleev’s Periodic law.

Answer. 1. The Russian Scientist Dmitri Mendeleev developed the periodic table of elements during the period 1869 to 1872 A.D.

2. Mendeleev organized the periodic table on the basis of the chemical and physical properties of the elements. He considered the fundamental property of elements, namely the atomic mass as standard and arranged 63 elements known at that time in an increasing order of their atomic masses.

3. He found that the elements with similar physical and chemical properties repeat after a definite interval.

4. On the basis of this finding, he stated that ‘properties of elements are a periodic function of their atomic masses’. This is known as Mendeleev’s periodic law.