Examlex
What accounts for more years of potential life lost than any other cause of death?
Reactants
Substances that undergo chemical changes in a reaction to form products.
Product
Substance formed by a chemical reaction. Compare with reactant.
Valence Shell
The outermost shell of an atom containing the electrons most involved in forming chemical bonds.
Nitrogen
A chemical element with symbol N and atomic number 7, essential for all living organisms as it is a key component of amino acids and nucleic acids.
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