BSC-2010 Chapter Notes - Chapter 2: Unified Atomic Mass Unit, Radiometric Dating, Chemical Polarity

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Organisms are composed of matter, which is anything that takes up space and has mass. Element a substance that cannot be broken down to other substances by chemical reactions. Compound a substance consisting of tow or more di erent elements combined in a xed ratio. Composed of both sodium (na) and chlorine (cl) in a 1:1 ratio. Of the 92 natural elements, about 20-25% are essential elements elements than organisms need to live a healthy life and reproduce. There are four elements that make up 96% of living matter . The other 4% are mostly made up of . Calcium (ca), phosphorous (p), potassium (k), and sulfur (s) Trace elements elements that are required by an organism but in only minute quantities. An example would be iron (fe), which is needed by all living organisms. Atom the smallest unit of matter that still retains the properties of an element. Atoms are composed of even smaller parts, called subatomic particles.

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