Sodium is a low-melting metal which reacts violently, and even explosively with water. Chlorine is an acutely toxic gas used on the battlefields of World War I. Sodium chloride is a common household product which can be eaten by the spoonful without immediate health risk. Chronic exposure, however, weakens the kidneys. Sodium chloride is neutral in pH. Sodium bicarbonate is a mild alkali that can be eaten by the spoonful. In fact, it is a major ingredient in many antacid tablets.
Sodium carbonate is a moderate alkali.
Eating it by the spoonful would not be lethal but it would be uncomfortable. Sodium hydroxide is a strong alkali that can eat flesh off of bones. A spoonful would probably be lethal. Sodium cyanide does not eat flesh. You could wash your hands in it without effect.