Corect: magneziul are valenta II, radicalul azotat are valenta I ; (NO3)I, radicalul carbonat are valenta II; (CO3)II, aluminiul are valenta III, sodiul are valenta I, Incorect: magneziul are valenta III, radicalul azotat are valenta II ; (NO3)II, radicalul carbonat are valenta I; (CO3)I, aluminiul are valenta II, sodiul are valenta II,

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