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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.
an ion that has both a positive and a negative charge on the same group of atoms.
monomers are chemically bonded together to form chains that link thousands of monomers in a...
variation in a repetitive way as you move through the periodic table vertically or horizontally...
the process by which nitrogen passes through the ecosystem.