Earth Sciences 1022A/B Lecture 3: Lecture 3
20 Dec 2018
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Document Summary
Provide raw material for things we use on a daily basis (if it can"t be grown it can be mined) Are the basis for life (make up elements essential to living things) A substance that is : is a solid, is non-living (inorganic, has a definite chemical composition, is naturally occurring, has a crystalline internal structure. A pure chemical substance that can not be broken down further by normal chemical means i. e. oxygen, nitrogen, iron, zinc, lead etc. Atom the smallest particle of matter that retains characteristics of an element. Elements are a specific type of atom. Has a nucleus made of protons and neutrons. Electrons orbit the nucleus in cloud like shells (each with their their own energy level) Almost all of the atoms mass is in the nucleus. Protons and neurons have a mass of 1 amu. Atoms like to have their positive and negative charges balanced (same number of protons and electrons)
