Question

newlands proposed the law of octaves.mendeleef suggested eight group for element in his table how do you explain these observation in terms of medern periodic in classification​

Answer 1

Answer:

Newlands proposed the Law of Octaves for classifying elements, and according to this law, every eighth element will show the same properties as the first element. But this too had limitations. This was only applicable to elements with atomic mass upto 40u, that is till calcium. Also noble gases could not be included.

But Mendeleev suggested a periodic table with 18 groups leaving space for elements undiscovered like eka silicon, and arranged elements according to their atomic number, not atomic mass. This helped in easy classification of elements. Also Mendeleev knew that there is a group of least reactive elements and left space for those elements, the noble gases to be included in the table.

This is how Mendeleev created a periodic table with 18 groups and 7 periods.

Explanation: