Question

These elements for placed in the same box in Newlands octave
1. Co and La
2. Co and Ni
3. Ce and Ni
4. Co and Ce​

Answer 1

Explanation:

Correct option is

C

Na,K

Na and K follows Newland's octave rule which states that if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements.