1. Properties of Atoms and the Periodic Table

2. Si Elements are pure substances.
2. The Periodic Table of the Elements is a chart that organizes the elements.
3. Each element’s name is abbreviated on the Periodic Table. 14 Si
28.086
Silicon

3. Si 14 28.086 Silicon Atomic Number = the # of protons Symbol
Atomic Mass (amu) = #Protons + #Neutrons
Name of the Element

4. Isotopes are atoms of the same elements, but with different numbers of neutrons.
There are 3 isotopes of Carbon:
Isotopes
Symbol
# protons
# neutrons
Atomic Mass
Carbon -12
C12 6
Carbon -13
C13
Carbon -14
C14

5. Isotopes are atoms of the same elements, but with different numbers of neutrons.
There are 3 isotopes of Carbon:
Isotopes
Symbol
# protons
# neutrons
Atomic Mass
Carbon -12
C12 6
Carbon -13
C13 7
Carbon -14
C14

6. Isotopes are atoms of the same elements, but with different numbers of neutrons.
There are 3 isotopes of Carbon:
Isotopes
Symbol
# protons
# neutrons
Atomic Mass
Carbon -12
C12 6
Carbon -13
C13 7
Carbon -14
C14 8

7. Isotopes are atoms of the same elements, but with different numbers of neutrons.
There are 3 isotopes of Carbon:
Isotopes
Symbol
# protons
# neutrons
Atomic Mass
Carbon -12
C12 6 12
Carbon -13
C13 7
Carbon -14
C14 8

8. Isotopes are atoms of the same elements, but with different numbers of neutrons.
There are 3 isotopes of Carbon:
Isotopes
Symbol
# protons
# neutrons
Atomic Mass
Carbon -12
C12 6 12
Carbon -13
C13 7 13
Carbon -14
C14 8

9. Isotopes are atoms of the same elements, but with different numbers of neutrons.
There are 3 isotopes of Carbon:
Isotopes
Symbol
# protons
# neutrons
Atomic Mass
Carbon -12
C12 6 12
Carbon -13
C13 7 13
Carbon -14
C14 8 14

10. Abundant means that one isotope is more common than the others.
Carbon-12 is carbon’s most abundant isotope because we have more C12 than C13 or C14

11. Elements are organized by increasing atomic number from left to right.

12. 2. Groups are the vertical columns (up and down)
Elements in the same group have the same number of electrons on their outer energy level.
3. Periods are the horizontal rows (side-to side) G R O U P S
Periods

13. 4. Elements are classified into 3 groups:
Metals - elements that are usually hard and can conduct electricity
Ex – aluminum, gold, calcium

14. Non-metals – gases
Ex- carbon, oxygen

15. Metaloids –have properties of both metals and non-metals
Ex – Boron, Silicon