Q. 35.0( 2 Votes )
First periodic cl
Elements were classified for the first time by Johann Wolfgang Döbereiner in 1829. He formed groups of 3 elements called ‘Triads’ in which the mass of the middle element is approximately equal to the average of masses of the first and the third element. He also stated that the properties of the middle element were intermediate between the other two elements.
Rate this question :
First periodic clRajasthan Board Science