During an expedition inside the crystalline cavern of a wandering comet, an autonomous survey probe extracts a solid specimen codenamed Astra-7. The material exhibits a shiny, reflective surface like a polished coin and behaves as a semiconductor whose electrical conductivity rises upon heating, yet it fractures into brittle shards rather than flattening when struck by a pneumatic hammer. Based on this combination of physical characteristics, how should the science team classify specimen Astra-7, and where is this class positioned on the periodic table?

A) Metalloid, positioned along the diagonal staircase boundary between metals and nonmetals.

B) Alkali metal, positioned in the far-left column of Group 1 among the most reactive elements.

C) Transition metal, positioned in the broad central block between Groups 3 and 12.

D) Halogen nonmetal, positioned in Group 17 directly adjacent to the noble gases.

Metals, nonmetals and metalloids Original Scenario-Based Download PDF

Chemistry · The Periodic Table · Chemistry · Organization of the Periodic Table

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The Periodic Table · Chemistry

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