In which of the following sets of elements, they
\( \mathrm{P} \) h...
In which of the following sets of elements, they
\( \mathrm{P} \) have nearly the same atomic size
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(1) \( \mathrm{Li}, \mathrm{Be}, \mathrm{B}, \mathrm{C} \)
(2) \( \mathrm{Mg}, \mathrm{Ca}, \mathrm{Sr}, \mathrm{Ba} \)
(3) \( \mathrm{O}, \mathrm{S}, \mathrm{Se}, \mathrm{Te} \)
(4) \( \mathrm{Fe}, \mathrm{Co}, \mathrm{Ni}, \mathrm{Cu} \)
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