2-20 - The Basics Elements and Minerals 2:55:00 PM Elements...

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The Basics Elements and Minerals 21:55 Elements Fundamentals unit of chemistry All matter can be described as either elements or compounds of elements 92 naturally occurring elements  thousands of components known, limitless number Atoms Basic unit of element Smallest particle that have the characteristics of the element Atoms for each element have a unique number of subatomic particles These determine the chemical properties of the element The major subatomic particles that control chemical characteristics are  protons, neutrons, and electrons The number of protons determines an elements atomic number The number of neutrons can change Atoms of an element with different numbers of neutrons are isotopes Isotopes all have different atomic weights Some are stable Unstable isotopes decay and are radioactive
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