That doesn't necessarily mean that the element is poisonous per se. Many good/healthy substances are poisonous at high levels,e.g.: Vitamin A poisoning [0] Wate

That doesn't necessarily mean that the element is poisonous per se. Many good/healthy substances are poisonous at high levels,e.g.: Vitamin A poisoning [0] Water poisoning [1] [0] https://en.m.wikipedia.org/wiki/Hypervitaminosis_A https://en.m.wikipedia.org/wiki/Hypervitaminosis_A [1] https://en.m.wikipedia.org/wiki/Water_intoxication https://en.m.wikipedia.org/wiki/Water_intoxication