CHEMISTRY PART 2 Periodic Table.  Atomic Number = # of protons  If the atom is neutral:  Atomic Number = # of electrons  Atomic Mass = # of protons.

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Presentation transcript:

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