The diagram shows a portion of the periodic table. Elements which were unknown during Mendeleev’s time have been removed. Using Mendeleev’s rules for arranging elements, which box would contain the metal gallium, which has an atomic number of 31 and an atomic mass of 70?

OPTIONS

Box 5.

Either box 2 or box 3.

Only box 2.

Only box 3.

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1 answer

Only box 2.

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