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Dudeeeeeeeeeeeee

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
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.  
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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  
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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.  
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transition metals   Groups 3-12 on the periodic table  
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lanthanides   any element of the lanthanide series.  
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actinides   the bottom row of the exstended part of the perodic table  
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solvent   a liquid capable of dissolving another substance:  
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