Student_02_1 - ACTIVITY 02-1 Atoms, Isotopes, and Ions WHY?...

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15 W HY ? Atoms are the fundamental building blocks of all substances. To begin to understand the properties of atoms and how they combine to form molecules, you must be familiar with their composition and structure. L EARNING O BJECTIVES Understand the composition and structure of atoms, isotopes, and ions Understand how atomic symbols and names identify the number of particles composing an atom, isotope, or ion S UCCESS C RITERIA Use atomic symbols to represent different isotopes and ions Given one or more of the following items, determine the others: name, atomic symbol, atomic number, mass number, neutron number, and electron number Calculate the percent of the atomic mass that is located in the nucleus of an atom Compare the size of an atom to the size of the atomic nucleus P REREQUISITES Calculation of percent Activity 01-1: Units of Measurement Activity 01-2: Unit Analysis I NFORMATION Matter , which is anything that has mass and occupies space, is composed of substances and mixtures of substances. A substance , or more explicitly, a pure substance , is a variety of matter that has uniform and constant composition. For example, pure water is a substance. Mixtures are composed of two or more substances. For example, salt water is a mixture, even though it is uniform, because the amount of salt in the water (the composition) can vary.
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This note was uploaded on 09/19/2011 for the course CHE 1112R taught by Professor Meghee during the Fall '11 term at St. Johns Duplicate.

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Student_02_1 - ACTIVITY 02-1 Atoms, Isotopes, and Ions WHY?...

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