Which pair is different from the others? (1) \( \mathrm{Li}-\mathrm...

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Which pair is different from the others?
(1) \( \mathrm{Li}-\mathrm{Mg} \)
(2) \( \mathrm{B}-\mathrm{Si} \)
P
(3) \( \mathrm{Be}-\mathrm{Al} \)
(4) \( \mathrm{Li}-\mathrm{Na} \)
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