Set of elements having one electron in their valence shell are:

Cl, Br, I

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Na, Mg, Al

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B, Al, Ga

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K, Rb, Cs

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Solution

The correct option is D K, Rb, Cs
The set of elements having one electron in the valence shell are $K, R b, C s$ .
They are alkali metals with outer electronic configuration $n s^{1}$ .

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Which of the sets of elements follows Newland’s octave rule:-

A)Be,Mg,Ca

B)Na,K,Rb

C)F,Cl,Br

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