Choose from the following as to what matches the description given below: [Promoter,Radicals,Gold, Sodium,Nucleus] a. A metal having variable valency. b. A group of negatively or positively charged atoms. c. A substance which improves the rate of a chemical reaction by improving the efficiency of a catalyst. d. An aggregate of protons and neutrons within an atom. e. The metal which melts in water to form a silvery ball and then burns to form golden yellow flame.
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