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Sodium (Na). Because It is present in the common salt(In form of Sodium Chloride- NaCl), which is found abundantly in oceans. Sodium is not found in free states in oceans due to is high reactivity. It will give a huge amount of heat enough for burning hydrogen, coming out in the reaction.

2 Na + 2 H2O ---->2 NaOH + H2

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14y ago

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