hello chemistry students: 9/21/15 chemcatalyst: 1. what are the three particles atoms are made of?...
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What is an Atom? 0 The atom is the smallest part of an element that still retains the properties of that element. 0 First proposed by DemocritusTRANSCRIPT
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Hello Chemistry Students: 9/21/15
ChemCatalyst:1.What are the three particles
atoms are made of?2.Draw a atom.
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The Atom: Calculating Protons, Neutron, and ElectronsChemistry/Pre-AP ChemistryMs. Lizette GutierrezAustin High School
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What is an Atom?0The atom is the smallest part of an element that still retains the properties of that element .
0First proposed by Democritus
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Structure of the AtomAtoms are composed of 2 regions:
0Nucleus0 The center of the atom 0Contains 99.9% mass of the atom0Hold protons and neutrons0Dense part of atom
0Electron cloud0Area surrounding the nucleus0Contains must of the volume of
the atom0 Mostly empty space 0Holds electrons
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Subatomic Particles An atom is composed of three subatomic particles:
0Proton (+)0 It’s a particle located IN THE NUCLEUS of an atom0 It has a charge of +1 0 mass of 1 amu (atomic mass units). 0 The protons determine the identity of element (Atomic
Number)0Neutron (0)
0 It’s a particle located IN THE NUCLEUS of an atom0 It has a charge of 0 (no charge)0 mass of 1 amu (atomic mass units)
0Electron (-)0 It’s a particle located AROUND THE NUCLEUS of an atom0 It has a charge of -1 0 mass of 0 amu (atomic mass units)
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How do the subatomic particles balance each other?
In an Neutral atom (assume):0 # PROTONS = # ELECTRONS0A neutral atom has an overall electrical charge
of Zero, because it contains the same number of protons (+) and electrons (-).
0 The neutrons have no charge; therefore they do not have to equal the number of protons or electrons
Carbon Atom
6 protons (+) = +66 electrons (-) = -66 neutrons (0) = 0____________________
0 (neutral)
+
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Bohr Model (Simplest Atomic Structure)
Energy Levels:• circular areas
around the nucleus where electrons travel
• Electrons in an atom are contained in specific energy levels (1, 2, 3, …) that are different distances from the nucleus.
Electron
Cloud
Electron (-)
Neutron (0)
Nucleus
Proton (+)
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Models of Atoms
Bohr Model
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Basic Atomic Structure Foldable
0 Using this PowerPoint fill in the information for each flap on your foldable
0 Glue into your Notebook.
0 Title: “THE ATOM”
0 BE NEAT!
0 Coloring Instructions 0 PROTONS – highlight pink0 NEUTRONS– highlight green0 ELECTRONS – highlight orange