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semiconductors Any of various solid crystalline substances, such as germanium or silicon, having electrical conductivity greater than insulators but less than good conductors, and used especially as a base material for computer chips and other electronic devices.
alkali metals any of the monovalent metals lithium, sodium, potassium, rubidium, caesium, and francium, belonging to group 1A of the periodic table. They are all very reactive and electropositive
alkaline-earth metals any of the group of bivalent metals including barium, radium, strontium, calcium, and, usually, magnesium, the hydroxides of which are alkalis but less soluble than those of the alkali metals.
transition metals Groups 3-12 on the periodic table
lanthanides any element of the lanthanide series.
actinides the bottom row of the exstended part of the perodic table
solvent a liquid capable of dissolving another substance:
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