1. Chemistry Part 2
Periodic Table

2. Periodic Table Atomic Number = # of protons If the atom is neutral:
Atomic Number = # of electrons
Atomic Mass = # of protons + # of neutrons
# of neutrons = atomic mass - # of protons

3. Periodic Table
Elements are in order of increasing atomic mass.

4. Periodic Table Periods: Horizontal rows. (1 to 7)
Number of electron shells.

6. Periodic Table Groups: Vertical columns. (1 to 18)
Share characteristics and properties.
Same number of electrons in outer shell.

8. Periodic Table Metals Non-Metals Metalloids Share specific properties.
Have properties of both metals and non-metals.

10. Periodic Table Alkali Metals Group 1 Silver colored metals
Very reactive

11. Periodic Table
Alkaline Earth Metals
Group 2
Reactive

12. Periodic Table Transition Metals Groups 3 to 11
Have more than one charge

13. Periodic Table Halogens Group 17 Extremely reactive
Form strong acid compounds
when bonded to H

14. Periodic Table
Nobel Gases
Group 18
Unreactive (for the most part)

15. Lanthanides
Outside periodic table
Period 6

16. Actanoids
Outside periodic table
Period 7

17. Synthetic elements
Elements from atomic #95 and above

18. Periodic Table Hydrogen is an exception:
It can behave like an alkaline metal or a halogen.

19. Periodic Table Elements of the Periodic Table

20. Practice
Page 97 # 15, 18, 19