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a group of elements between the metals and the non-metals. They are semiconductors and have some metallic and some non-metallic properties.
the phase change of a substance from the solid phase directly into the gas phase without passing...
everything around, and excluding, the chemical system itself.
variation in a repetitive way as you move through the periodic table vertically or horizontally...
(also called or polypropylene) colourless transparent thermoplastic used where a flexible...
water droplets that combine with one another, grow too heavy to stay in the air, and fall to the...