How can you determine if an element is toxic?

Answer 1

Well elements toxicity can be determined by their reactivity.

However, it all depends on whether you mean actual elements or chemicals. If it is an element you mean, then it is determined by the reactivity by itself and if the reaction is mutagenic, or has any other adverse effect. However since its rare to find them alone, chemical toxicity is determined either by finding the LD50 (lethal dose at which 50% of animal subjects die), or they [chemists] look at the structure and determine electro-negativity and density and functional groups to determine what reaction will occur in specific environments.

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Answer 2

Naomi Aronson

To find out how toxic an element is, check toxicology databases, evaluate exposure thresholds, take into account chemical properties, and read through the available scientific literature.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.