What is a resource? Anson's: Something which can be used. What are natural resources? Ans: Anything in the environment which can be used. What are the types of resources? Ans: Two, i.e. Exhaustible...
How many elements known to us? Ans: 118 Who gave the theory of triads? Ans: Dobereiner Who gave Octave theory? Ans: Newlands What is the drawback of Dobereiner traits? Only three triads were recognised...