After the discovery of large number of elements it become ness elfy them and arrange them in a regular manner in order of their periodic properties. In tore. Johann Wolfgang Dobereiner tried to arrange the elements with similar properties into groups. He identified some groups of three elements having similar physical and chemical properties, known as Dobereiners triads. In 1865, John Newlands arranged all known elements in the order of increasing atomic masses and found that the properties of every eighth element are similar to the properties of the first element. (ii) Example of Dobereiner's triad is

Options

A. Li, Al, Ca
B. Li Na K
C. Li, K, Na
D. K, Al, Co

Answer

B