Question

Al-Razi, Dobereiner, Newland and Mandeleeve contributed in the development of:
a) The concept of periodicity of the properties of the elements.
b) Law of triads
c) Law of octaves
d) Periodic law​

Answer 1

Answer:

Al-Razi, Dobereiner, Newland and Mandeleeve contributed in the development of:

c) law of octaves...