Questions and Answers
Which property of alkali metals makes them highly reactive?
Small size and low ionization enthalpy
Why do the alkali metals tarnish in dry air?
Formation of oxides
Which alkali metal forms a peroxide when reacting with oxygen?
Sodium
What is the trend in hydration enthalpies of alkali metal ions as you move down the group?
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Which alkali metal has the lightest density?
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What characteristic property allows caesium and potassium to be used as electrodes in photoelectric cells?
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Which element shows similarities to magnesium in its properties?
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What is the common valence electron configuration for all alkali metals?
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Why are alkali metals considered the most electropositive metals?
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What is responsible for the regular trends in physical and chemical properties of alkali metals?
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Why are alkali metals never found in free state in nature?
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What property of alkali metal atoms increases with atomic number in a period?
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