Which of the following is not a Dobereiner triad - \( \mathrm{P} \)...

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Which of the following is not a Dobereiner triad -
\( \mathrm{P} \)
(1) Li, Na, K
(2) \( \mathrm{Mg}, \mathrm{Ca}, \mathrm{Sr} \)
WV
(3) \( \mathrm{Cl}, \mathrm{Br}, \mathrm{I} \)
(4) \( \mathrm{S}, \mathrm{Se}, \mathrm{Te} \)
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