Which of the following set of elements obeys \( \mathrm{P} \) Neẃla...

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Which of the following set of elements obeys
\( \mathrm{P} \) Neẃland's octave rule -

W.
(1) \( \mathrm{Na}, \mathrm{K}, \mathrm{Rb} \)
(2) \( \mathrm{F}, \mathrm{Cl}, \mathrm{Br} \)
(3) \( \mathrm{Be}, \mathrm{Mg}, \mathrm{Ca} \)
(4) B, Al, Ga
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