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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 Democritus
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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.
The Atom: Calculating Protons, Neutron, and ElectronsChemistry/Pre-AP ChemistryMs. Lizette GutierrezAustin High School
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
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
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)
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)
+
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 (+)
Models of Atoms
Bohr Model
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
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