chemistry basics - Chemistry Basics Chemistry is the...

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Chemistry Basics Chemistry is the science of matter and how it reacts and changes. Biochemistry is the chemistry of livings organisms. Matter Anything that takes up space and has mass Mass The amount of material in matter On Earth, mass is equivalent to weight Chemistry Basics cont’d Atoms – smallest stable units of matter Composed of subatomic particles Protons (p ) Have a positive electrical charge Exist in nucleus Neutrons (n or n 0) Are electrically neutral (uncharged) Exist in nucleus Electrons (e ) Have a negative electrical charge Are much smaller than protons or neutrons (about 1/1836 the mass) Exist in an electron cloud that surrounds nucleus Atoms and Elements Atoms and elements Atoms normally contain equal numbers of protons and electrons Atomic number Total number of protons in an atom Atomic Mass number Total number of protons and neutrons in an atom Element

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