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the layer from 80 km to 90 km above the surface of the Earth.
a crystal lattice of positive kernels in a sea of delocalised electrons to which they are...
a group of elements between the metals and the non-metals. They are semiconductors and have some...
a group of elements that are good conductors of heat and electricity.
a collection of more than one pure substance in no fixed proportion.
a measure of the amount of substance per unit volume. Unit: mol.dm-3
the volume of 1 mole of gas. The molar gas volume is equal for all gasses at a given temperature...