Amongst the following, which are the two elements that Newlands placed in the same slot and positioned in the same column with flourine, chlorine and bromine?

Cobalt and nickel

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Cobalt and calcium

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Nickel and calcium

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Cobalt and Cerium

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Solution

The correct option is A Cobalt and nickel
Newlands placed cobalt and nickel in the same slot and positioned them in the same column with fluorine, chlorine and bromine that possess different properties compared to these two elements (Cobalt and Nickel). This is one of the demerits of Newland's law of octaves.

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