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Unformatted text preview: but different mass numbers (different numbers of neutrons).- Examples : 12 C, 13 C, 14 C- Radioisotopes are unstable isotopes that spontaneously decay into more stable forms (it can take up to thousands of years for half the atoms in an element to decay to the stable state)- Radioactivity can be detected with scanning devices, & radioisotopes can be incorporated into biological moleculesthis makes radioisotopes useful tools for biological research & medicine). Carbon (C), Oxygen (O), Hydrogen (H) & Nitrogen (N) make up > 96% of the mass of a person- other elements in the human body: Calcium (Ca), Phosphorus (P), Potassium (K), Sulfur (S), Sodium (Na), Chlorine (Cl), Magnesium (Mg), Iron (Fe), Iodine (I) Molecules : 2 or more atoms held together by chemical bonds- when 2 or more atoms of the same element bind, they form a molecule of that element- when 2 or more different atoms bind, they form one molecule of a compound...
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- Fall '10