What is aqueous solution give few examples

An aqueous solution is a solution in which the solvent is water. It is mostly shown in chemical equations by appending (aq) to the relevant chemical formula. For example, a solution of table salt, or sodium chloride (NaCl), in water would be represented as Na+(aq) + Cl−(aq).

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indium, and thallium have three electrons i think

fe 55.85 g/mol and h2o 18.02 g/mol.