CHEMISTRY PART 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
Periodic Table Elements are in order of increasing atomic mass.
Periodic Table Periods: Horizontal rows. (1 to 7) Number of electron shells.
Periodic Table Groups: Vertical columns. (1 to 18) Share characteristics and properties. Same number of electrons in outer shell.
Periodic Table Metals Share specific properties. Non-Metals Share specific properties. Metalloids Have properties of both metals and non-metals.
Periodic Table Alkali Metals Group 1 Very reactive
Periodic Table Alkaline Earth Metals Group 2 Reactive
Periodic Table Transition Metals Groups 3 to 11 Have more than one charge
Periodic Table Halogens Group 17 Form strong acid compounds
Periodic Table Nobel Gases Group 18 Unreactive (for the most part)
Periodic Table Hydrogen is an exception: It can behave like an alkaline metal or a halogen.
Periodic Table Elements of the Periodic Table Elements of the Periodic Table
Practice Page 97 # 15, 18, 19