1. Notes Date SPI 0807.9.9 Periodic Table Tennessee SPI Objective:
Use the periodic table to determine the properties
of an element.
Essential Question(s)
How do I use the periodic table to…
a) …determine the atomic number?
b) …determine the atomic mass?
c) …determine the number of sub-atomic particles?
d) …determine other properties of an element (atom)?
Success Criteria
I can use the periodic table to determine the properties of an element (atom).

2. We use a chart to organize elements called…
The Periodic Table
F.Y.I We have discovered 98 naturally occurring elements
F.Y.I. We have also formed 20 man-made elements
= 118 total

3. H He 1.0 1 4.0 2 Helium Hydrogen Notes Science SPI 0807.9.9
Periodic Table
Notes
Science .
Most common element (atom) in the universe is hydrogen
(About 73% of all matter is hydrogen)
2nd most common element (atom) in the universe is helium
(About 25% of all matter is helium)
Stars mainly consist of these two elements!
Hydrogen H
1.0 1
Helium He
4.0 2
73% of all matter
25% of all matter

4. Notes Science Periodic table SPI 0807.9.9 Periodic Table Purpose
Is a chart of all known chemical elements
Displays the different types of atoms (called elements)
Purpose
Is a tool used to reference information about elements
How is it organized
Organized into rows called periods
Organized into columns called groups (also called families)
Arranged in numerical order by the atomic number
Also arranged other ways (metals, nonmetals, metalloids, etc.)

5. H 1 1.0 Hydrogen Notes Science Info in each rectangle SPI 0807.9.9
Periodic Table
Notes
Science .
Info in each rectangle
Atomic number
is the number of protons!
matches the number of electrons!
Is a whole number
Usually but not always at the top
Chemical symbol
Element name
Atomic mass
Is the average mass of a sample of hydrogen atoms
Is a decimal number
Usually but not always at the bottom
Hydrogen H
1.0 1

6. How to determine the number of neutrons Lithium atoms have 4 neutrons
Protons: Three
Electrons: Three
Neutrons: ??????
Two Simple Steps:
Step 1: Round the atomic mass to the nearest whole number
Example: rounds to 7
Step 2: Subtract the atomic number from this rounded number
(Atomic number is 3)
Example: = 4 neutrons
Atomic Number
Lithium 3 Li
6.941
Atomic Mass
Lithium atoms have 4 neutrons

7. Answer these questions on your paper
SPI
Periodic Table
Review
Science .
Answer these questions on your paper
(1) What are elements?
Elements are the different types of atoms, pure substances
(2) What are the rows and columns called?
Rows are periods and columns are groups or families
(3) Describe 3 ways the periodic table is organized.
…organized in rows (periods) according to the atomic number.
…organized in columns (families) according to similarities
…organized into metals, nonmetals, and metalloids
(4) What is an atomic number?
It is the number of protons in an atom
(5) What is atomic mass?
It is the average mass of a sample of the same kind of atoms

8. Write down your answers
SPI
Periodic Table
Review
Science .
Write down your answers
What is oxygen's atomic number and atomic mass?
Oxygen 8 O
16.0
Atomic Number
Atomic Mass

9. O 8 Oxygen Review Science Write down your answers …has 8 protons
SPI
Periodic Table
Review
Science .
Write down your answers
How many protons and electrons does each atom of
oxygen have?
Oxygen 8 O
16.0
Atomic Number
…has 8 protons
…also has 8 electrons
The number of protons and electrons are always the same.

10. Write down your answers Oxygen atoms have 8 neutrons
SPI
Periodic Table
Notes
Science .
Write down your answers
How many neutrons does each atom of oxygen have?
Two Simple Steps:
1) Round the atomic mass to the nearest whole number
Example: 16.0 rounds to 16
2) Subtract the atomic number from this rounded number
Reminder: Atomic number is 8
Example: = 8 neutrons
Oxygen 8 O
16.0
Atomic Number
Atomic Mass
Oxygen atoms have 8 neutrons

11. Science Review Questions SPI 0807.9.9 Periodic Table
How many neutrons?
1) Round the atomic mass
85.5 rounds up to 86
2) Subtract the atomic number from the atomic mass.
86 minus 37 = 49 neutrons
Atomic Number
Atomic Mass

12. The number of protons and electrons are always the same.
SPI
Periodic Table
The number of protons and electrons are always the same.
Science
Questions
How many neutrons?
1) Round the atomic mass
20.2 rounds down to 20
2) Subtract the atomic number from the atomic mass.
20 minus 10 = 10 neutrons
Atomic Number
(number of protons)
Atomic Mass

13. Science Questions SPI 0807.9.9 Periodic Table Atomic Mass (Bromine)
Atomic Number
(Iodine)

14. The number of protons and electrons are always the same.
SPI
Periodic Table
The number of protons and electrons are always the same.
Science
Questions
How many neutrons?
1) Round the atomic mass
47.9 rounds up to 48
2) Subtract the atomic number from the atomic mass.
48 minus 22 =26 neutrons
Atomic Mass
Atomic Number
(number of protons)

15. Science Questions SPI 0807.9.9 Periodic Table Atomic Number
(number of protons)
Atomic Mass
(Bromine)