Examlex
Which of the following is not a key element of an E-R model?
Arsenic
A naturally occurring metallic element with the symbol As and atomic number 33, known for its toxicity and used in pesticides, herbicides, and insecticides.
Ground Water
Water held underground in the soil or in pores and crevices in rock.
Equilibrium
A state in a chemical reaction where the rates of the forward and reverse reactions are equal, leading to no net change in the concentration of reactants and products.
Arsenopyrite
A metallic gray, natural mineral compound of arsenic, iron, and sulfur, often associated with the occurrence of gold.
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