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# Atomic Structure

A general presentation for middle level high school chemistry students on properties of atoms and their structure.
by

## Kevin G

on 26 September 2012

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#### Transcript of Atomic Structure

Exploring the Atom Prezi by Mr. Greto, Atomic Structure What types of things can't you build with just 3 Legos? Using an unlimited amount of the following three Lego pieces, what types of things can you create? A. An atom is the smallest particle of an element
that retains its identity in a chemical reaction. I. What is an Atom? 1. Electrons
2. Nucleus
3. Protons
4. Neutrons II. Structure of an Atom What are Isotopes? Why does hydrogen weigh 1.00794 g/mol? Deeper into the Atom Think-Pair-Share Day 1: Atomic Mass: Candium Day 4 - Atomic Models Discovering the Periodic Table 1. An interest
2. Another interest
3. Something you want to see incorporated in the lessons Name: 1. Fitness - Grip Sport
2. Philosophy - Perpetual Progress.

3. Magic tricks,
Neil DeGrasse Tyson
Dinosaurs Mr. Greto You'd be surprised with what you can do with a few Legos 3 Sub-atomic particles 3 Legos > Positive Charge
Found in the Nucleus
Relative Mass = 1 amu
Atomic Number = #protons in an element. 3. Proton A Subatomic particle with a Negative charge
Occupy the most volume in an atom
Distributed around the nucleus
Relative Mass = 1/1836 amu (Atomic Mass Units) 1. Electrons Subatomic particles with no net charge
Found in the Nucleus
Relative mass = 1 amu 4. Neutrons 2. Nucleus (pl. Nuclei)
tiny, dense center of the atom Contains all the protons and neutrons.
Contains virtually all the mass of the atom Discover It! Electric Charge Size of the Nucleus Oddities of the Atom Mystery of the Electron 1. Atomic Number
#Protons
2. Mass Number
#Protons + #Neutrons
3. Charge (Ions)
#Protons - # Electrons III. Distinguishing Among Atoms The total number of protons and neutrons in the nucleus of an atom.
#protons + #neutrons 2. Mass Number An atom with a net charge
Ions are atoms that are either missing or have extra electrons
Charge: #protons - #electrons 3. Ions a. Positive (+) : #Protons > # Electrons
b. Negative (-) : #Protons < #Electrons
c. *Neutral: #Protons = # Electrons
*Not an Ion Charge of an atom Atoms with the same number of protons but different numbers of neutrons
Have different Mass Numbers 4. Isotope Carbon has 3 stable Isotopes: Carbon-12 Carbon-13 and Carbon-14, with 6, 7, and 8 Neutrons respectively. Example: Weighted average mass of an element's isotopes.
Based on the mass and the relative abundance of the isotopes as they occur in nature. 5. Atomic Mass www.ptable.com --> Isotopes tab Practice Makes Perfect
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