The first I.E. of \( \mathrm{Na} . \mathrm{Mg}, \mathrm{Al} \) and ...

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The first I.E. of \( \mathrm{Na} . \mathrm{Mg}, \mathrm{Al} \) and \( \mathrm{Si} \) are in the order:
\( \mathrm{P} \)
(1) \( \mathrm{Na}\mathrm{Mg}\mathrm{Al}\mathrm{Si} \)
W
(2) \( \mathrm{Na}\mathrm{Al}\mathrm{Mg}\mathrm{Si} \)
(3) \( \mathrm{Na}\mathrm{Al}\mathrm{Si}\mathrm{Mg} \)
(4) \( \mathrm{Na}\mathrm{Mg}\mathrm{Al}\mathrm{Si} \)
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