An unknown solid is hard, but malleable and melts at 1700°C. The liquid form conducts electricity. The solid form also conducts electricity. What kind of crystal is this?

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The Answer of An unknown solid is hard, but malleable and melts at 1700°C. The liquid form conducts electricity. The solid form also conducts electricity. What kind of crystal is this?

An Unknown Solid Is Hard, but Malleable and Melts at 1700°C