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Name: _____________________________________ Date: __________________________ Period: _____ Directions: Complete the charts. Nucleus Location: The center of an atom Contains: Protons and Neutrons Overall charge: Positive (b/c protons are positive & neutrons have no charge) Equal to: The Mass Number Electron Cloud Location: Outside of the Nucleus… mostly empty space Overall charge: Negative Contains: Electrons Other Names: Energy shells, Energy levels, Electron shells Subatomic Particles Particle Charge Location Size Protons + Nucleus 1 amu Electron Cloud 1/1856 amu Nucleus 1 amu Electrons Neutrons Directions: Write in a statement for each section of the Venn diagram. A. Positive part of an atom Protons B. Negative part of an atom Electrons D. A. C. Part of an atom with no charge B. D. Electrically charged parts of an atom E. F. G. E. Subatomic particles of an atom Neutrons F. Total the mass number, 1 amu, located in the nucleus C. G. Parts in an atom Directions: Fill in the charts below. 14 Si 28.086 Silicon A Atomic Number P Protons E Electrons M Mass Number A - Atomic Number N Neutrons Atomic Number Symbol Mass Number (Round) Element Name 8 O 15.999 Oxygen 20 Ca 40.078 Calcium A: 8 M: 16 P: 8 A: 8 E: 8 N: 8 A: 20 M: 40 P: 20 A: 20 E: 20 N: 20 Protons determine the identity of an element Directions: Determine the identity of each of the following atom models. Helium Boron Lithium Directions: Place the atom models in order from oldest (1) to most current (4). 4 1 3 2 The electrons in the last shell of the Bohr atom model are called Valence Electrons The major limitation to the Bohr model is that it leads us to believe that electrons are located in neat orbits when they are actually free moving_____________________________________________________________________ Directions: Label the parts in the atom models. Neutron Proton Energy Levels Nucleus Electron Proton Electron Electron Cloud Neutron Nucleus