Chemistry
CHemistry review
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Notes 10/07 Matter- anything that has mass and takes up space All matter is composed of atoms There are 92 naturally occurring elements 6 of these elements (CHNOPS-Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, Sulfur) make up 90-95% Elements- formed by explosion of supernova stars When this explosion occurs, they spew gas and a cloud of gas and dust is formed. This cloud is a nebula Everything is formed from this star explosion dust (including us) A nebula created our solar system 4.6 billion years ago Atoms have subatomic particles called: Protons: in the nucleus, positive charge, has mass, # of them cannot be changed chemically Protons are the identity of an element of the atomic number, it defines the element like C(carbon) has an atomic number of 6= 6 protons
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