Examlex
According to NHANES III data,children aged _____ have the highest rates of daily television viewing.
Covalent Bonds
A type of chemical bond involving the sharing of electron pairs between atoms, which results in a stable balance of attractive and repulsive forces between atoms.
Atom
The basic unit of a chemical element, consisting of a nucleus of protons and neutrons, with electrons orbiting around it.
Substance
A form of matter with a specific chemical composition and set of properties that distinguish it from other forms of matter.
Common Isotope
A variant of a chemical element that has the same number of protons but a different number of neutrons in its nucleus, and is normally more abundant than other isotopes.
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