PDF chapter test TRY NOW
Answer the following questions:
Answer variants:
It's because they've completely filled their outer shells and look same.
(i) Co and Ni, (ii) Ce and La
When elements are arranged in increasing order of their atomic number every eighth element resembles the first.
Atomic number of X = \(15\), Atomic number of Y = \(19\)
1. Give reason why noble gases are placed in a separate group in the modern periodic table.
2. Name any two pairs of elements which were adjusted by Newlands in the same slot.
Register for free to see more content