properties_of_matter - Matter, Elements,and Compounds...

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MATTER : anything that takes up space and has mass. ELEMENT : a substance that cannot be broken down by ordinary means. The material making up matter. There are 92 naturally occurring elements, of these 25 are essential to life. 4 of these make up 96% of living matter ( Carbon, Hydrogen, Oxygen,and Nitrogen). The rest are called trace elements. These are required in minute amounts( Zinc, cobalt, iron, magnesium). Small units of matter are called atoms. Protons (+), neutrons (0), and electrons (-), are the subunits of atoms. Their mass is measured in units called Daltons . ATOMIC NUMBER: THE TOTAL NUMBER OF PROTONS IN AN ATOM. ATOMIC MASS: THE TOTAL NUMBER OF NEUTRONS AND PROTONS IN AN ATOM. ISOTOPES: Different atomic forms caused by varying the number of neutrons. Example: Normal carbon is 12, carbon isotope is 14. Some isotopes are radioactive, they undergo a transformation to gain a stable condition. This transformation is called the half-life of the isotope. Example: Let's say the half-life of carbon 14 is 5,000
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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properties_of_matter - Matter, Elements,and Compounds...

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