Which one of the following is a different pair? (a) \( \mathrm{Li},...

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Which one of the following is a different pair?
(a) \( \mathrm{Li}, \mathrm{Na} \)
(b) \( \mathrm{Be}, \mathrm{Ba} \)
(c) N, As
(d) \( \mathrm{O} \), At
\( \mathrm{P} \)
W
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