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The most electronegative element among sodium, bromium, fluorine and oxygen is
The most electropositive element among the following is
The most important ore of aluminum is
The most important ore of lead is
The most pure form of Carbon among the options is
The most reactive among the halogens is
The most suitable unit for expressing nuclear radius is:
The most suitable vessel for storing concentrated sulphuric acid is
The name of instrument used to measure the speed of the wind is
The name of unreactive gas is