1. Q: What is the Periodic Table?
Where we can look to find elements
Any element in the world is found here. If it’s not here, it’s not an element.
For example:
Hydrogen and oxygen are found on the PT (H and O), they are both elements.
Water is made of these elements (H2O), but is not found on the PT. Water is a COMPOUND, not an element

2. Q: What is the Periodic Table?
The table is organized based on physical and chemical properties/characteristics of elements such as:
What will happen when it is mixed with a certain chemical?
How many of each subatomic particle are present?
What state of matter is it at room temperature?
What does it look like (shiny, dull, etc)?
How big is an atom of that element?

3. Q: How do I read the periodic table?
First, you must realize that each box contains information about ONE ELEMENT

4. Q: How do I read the periodic table?
The smaller number in each box (usually at the top) is called the atomic number.
Tells us how many p+ an atom of that element has
Tells us how many e- an atom of that element has
*** This is true ONLY if the atom has an overall NEUTRAL CHARGE

5. Atomic Number
Atomic Number 8 O
Oxygen
15.999

6. Q: How do I read the periodic table?
The larger number (usually at the bottom) represents the atomic mass.
Measured in amu (atomic mass units)
Tells us the total number of p+ and n0 in an atom
How can I use this to find JUST the number of n0?
Atomic mass – Atomic number = # n0
Atomic mass MUST be rounded to the nearest whole number to find #n0

7. Atomic Mass 8 O
Oxygen
Atomic Mass (amu)
15.999

8. Q: How do I read the periodic table?
Chemical Symbol
Usually only one or two letters
Some have three letters- these are manmade and will likely get renamed.
First letter is always capital, second is always lowercase
Some symbols are based on the Latin names for the element
Ex. Aurum – gold – Au
Ferrum – iron – Fe

9. Chemical Symbol and Name8 O
Chemical Symbol
Chemical Name
Oxygen
15.999

10. Example: Find the element Bismuth (Bi) on your PT
Example: Find the element Bismuth (Bi) on your PT. Use the PT to find the following:
Atomic Number:
Atomic Mass:
Symbol:
# p+ =
# e- =
# n0 =
CHECK YOUR ANSWERS on the next slide!

11. Example: Find the element Bismuth (Bi) on your PT.
Atomic Number: 83
Atomic Mass: 209 (approx)
Symbol: Bi
# p+ = 83
# e- = 83
# n0 = 126 (209 – 83)

12. Agenda Items
Part 2 of HW pkt (Due Monday)