Download Lesson Outline - WordPress.com

•
What are Atom Bombs?
•
What is an Atom?
•
The Structure of an Atom
•
How to Determine the Number of Protons, Neutrons,
Electrons
•
Myth Buster Challenge
•
Isotopes
* B3.1 Explain the relationship between the
atomic number and the mass number of an
element, and the difference between isotopes
of an element
* B3.2 explain the relationship between isotopic
abundance of an element’s isotopes and the
relative atomic mass of the element
Atom: Is the smallest particle of an element that still
retains (contains) the identity and property of the
element
The Modern Atomic Theory:
* All matter is made up of tiny particles called atoms.
Atoms contain subatomic particles: Protons,
Neutrons, Electrons!
* The atoms of one element Cannot be converted into
atoms of another element in a chemical reaction.
* All atoms of one element have the same properties,
such has mass and size
* Atoms of different elements combine in specific
proportions to form compounds
Are Protons, Neutrons, and Electrons the
smallest Particles known to man?
Are atoms of an element with the same number of protons and
electrons, but have a different number of neutrons
Ex.
Oxygen-16 (8 protons, 8 electrons 8 neutrons)
Oxygen-17 (8 protons,8 electrons, 9 neutrons)
Oxygen-18 (8 protons,8 electrons, 10 neutrons)
If Garth Brookes has 32 pennies (1c) and 12
nickels (5c) in his hand. What is the average cost
of a coin in his hand?
Average Atomic Mass (Atomic Mass): is the
average of the masses of all the isotopes of an
element
Oxygen’s atomic mass is: 15.99 u or g/mol
Isotopic abundance: is the amount of an isotope
compared to all of the isotopes of an element,
expressed as percent (%)
Ex. Oxygen-17 makes up 34% of all oxygen
isotopes
Questions:
1. Boron has two isotopes. The first, has a mass of 10.01 u and
makes up 19.78%. The second, has a mass of 11.01 u and makes
up 80.22%. What is the average atomic mass of Boron?
2. Silver has two isotopes, the first has a mass of 106.9 u and
an abundance of 51.8%, the second has a mass of 108.9 u and
an abundance of 48.2. What is the average atomic mass of
silver?
3. Lithium has two isotopes and an average atomic mass of
6.94 u. If isotope 1 has a mass of 7.015 u and an abundance of
92.58%, what is the mass of second isotope if it has an
abundance of 7.42%?