
Calculating Atomic Mass
Presentation
•
Chemistry
•
9th - 12th Grade
•
Hard
Joseph Anderson
FREE Resource
10 Slides • 10 Questions
1
Atomic Number, Average Atomic Mass, Mass Number, Isotopes
2
3
4
5
Multiple Choice
How is average atomic mass determined?
By adding all of the protons and neutrons together.
by summing the masses of the element's isotopes, each multiplied by its natural abundance on Earth
By multiplying of often protons and neutrons occur and adding up the averages.
6
Multiple Choice
What are AMU's
Atomic Mass University
Atomic Mass Units
Atoms mean unity
All Mass United
7
Multiple Choice
What are AMU's
The unit used to measure the mass of atoms and molecules. Equal to 1/12 the mass of Carbon-12
Unit to measure the radius of an atom
Equal to a gram
The unit used to measure large quantities of atoms
8
Multiple Choice
What does the atomic number represent?
The number of electrons
The number of protons
The number of neutrons
The number of protons and neutrons together.
9
10
11
12
13
Isotope Symbols
As you can see to the right there are certain ways elements and isotopes are represented as symbols. There is the element symbol (the biggest part). Then the upper number will the the mass number (number of protons + number of neutrons) and the lower number is just the atomic number (number of protons).
14
Isotope Symbol Examples
As you can see here the element is Cu (copper), and it has a mass number of 63 and atomic number of 29. With this information I can determine that this copper atom has 34 neutrons.
15
Multiple Choice
What does the mass number represent?
The number of electrons
The number of protons
The number of neutrons
The number of protons and neutrons together.
16
Multiple Choice
What does the atomic number represent?
The number of electrons
The number of protons
The number of neutrons
The number of protons and neutrons together.
17
Multiple Choice
If an atom has 5 protons and 6 neutrons what is the proper name of the isotope?
Boron-1
Boron-11
Carbon-11
Carbon 11
Boron Carbonate
18
Multiple Choice
How many neutrons does an atom of symbol pictured have?
26
-26
70
19
Multiple Choice
How many protons does an atom of symbol pictured have?
22
26
70
20
Multiple Choice
What is the total number of particles in the nucleus atom of symbol pictured have?
22
70
48
Atomic Number, Average Atomic Mass, Mass Number, Isotopes
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