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ATOMIC STRUCTURE WHAT ARE THE 3 MAJOR PARTS OF AN ATOM? Proton Neutron Electron ATOM VIDEO CLIP DESCRIBE PROTON •Positive Charge •Mass of 1 atomic mass unit (amu) •Found in the nucleus •Equal to the atomic Number •Determines the element •Remember PP (Protons are positive) DESCRIBE NEUTRON •No charge •Mass of 1 amu •Found in the nucleus •Number of neutrons + number of protons = mass number •To get the number of neutrons, mass number – atomic number •Remember NN (No charge on Neutrons) DESCRIBE ELECTRON • Negatively charged • No mass • Found in the electron cloud • In a neutral atom = equal to the number of protons DESCRIBE NUCLEUS The nucleus is the central part of an atom. It is composed of protons and neutrons. The nucleus contains most of an atom's mass. It was discovered by Ernest Rutherford in 1911. GATHERING INFORMATION FROM THE PERIODIC TABLE Element Symbol Atomic Number Mass Number Number of Protons Calcium Boron Zn Rh 41 35 Sodium Number of Neutrons Number of Electrons DIAGRAM SHOWING THE LOCATION OF EACH PART OF THE ATOM. http://www.eskom.co.za/nuclear_energy/fuel/fuel.html DIAGRAM SHOWING THE LOCATION OF EACH PART OF THE ATOM. See more diagrams at: http://www.bmb.psu.edu/courses/bisci004a/chem/basechem.htm DIAGRAM SHOWING THE LOCATION OF EACH PART OF THE ATOM. http://www.bmb.psu.edu/courses/bisci004a/chem/atoms.jpg DESCRIBE ISOTOPE Atoms that have the same number of protons but different numbers of neutrons DESCRIBE ISOTOPE Example: http://education.jlab.org/glossary/isotope.html WHAT IS THE ELECTRON CLOUD MODEL? Model of the atom pictures the electrons moving around the nucleus in a region called an electron cloud. The electron cloud is a cloud of varying density surrounding the nucleus. The varying density shows where an electron is more or less likely to be. Atoms with electrons in higher energy levels have additional electron clouds of different shapes that also show where those electrons are likely to be. For more information, click here: http://regentsprep.org/Regents/physics/phys05/catomodel/cloud.htm WHAT IS THE ELECTRON CLOUD MODEL? DIAGRAM 1: WHAT IS THE ELECTRON CLOUD MODEL? DIAGRAM 2: