For metalloids on the periodic table, how do the group number and the period number relate?

Moving along the metalloid staircase from boron toward tellurium, the group number generally increases as the period number increases: boron is in group 13, period 2, while tellurium is in group 16, period 5. Thus, lower group numbers go with lower period numbers, and the staircase moves down as it goes from left to right. Choice D gives the matching group-and-period relationship but incorrectly says the staircase moves up.

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