Examlex
The city with the highest level of outdoor air pollution is_______________.
Molecules
The smallest units of a chemical substance that can exist independently while retaining the properties of the substance.
Mole
The atomic mass of an element or the molecular mass of a compound, expressed in grams; one mole of any substance has 6.02 x 10^23 units (Avogadro’s number).
Covalent Bonds
Chemical bonds formed by the sharing of electron pairs between atoms.
Valence Electrons
The electrons in the outermost shell of an atom that are involved in forming chemical bonds.
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