monday october 22, 2012 (ws - valence electrons and electron configuration)
TRANSCRIPT
MondayOctober 22, 2012
(WS - Valence Electrons and Electron
Configuration)
Bell RingerMonday, 10-22-12
What two pieces of information are needed in order to calculate the
average atomic mass number of any element on the Periodic Table.
the mass numbers of the different isotopes of the element
the relative abundance (%) of each of the isot0pes.
Announcements
Assignment Currently Open
Summative or Formative? Date Issued Date Due Date Into
GradeSpeed Final Day
QUIZ 6 S3 10/5 10/5 10/26
QUIZ 7 S4 10/12 10/12 10/26
Pop Quiz – The Periodic Table and the Periodic Law
F4 10/16 10/16
WS – Average Atomic Mass F5 10/18 10/22 10/24
QUIZ 8 S5 10/19 10/19 11/2
Chemical Bonding
Unit 4
Valence Electrons …Two very important
conditions for atoms are:
electrical neutralitychemical stability
All atoms that have equal numbers of
protons and electrons are electrically neutral.
However, only the Noble gases are also
stable.
All other atoms bond to form chemical
compounds because that’s the way to become stable.
… the runners on the outside lane of
the track
In the process of bonding, atoms either
lose, gain, or share their valence
electrons.
Remember that these valence electrons are those in the atoms’ outermost, highest
energy level, and as a result are the ones most subject to the influence of other
nearby atoms or ions.
Valence Electrons
In this chemistry class, we will deal primarily with valence electrons
located in an atom’s highest energy level s- and p- sublevels.
For example, the element sodium has an electron configuration
notation of1s2, 2s2, 2p6, 3s1
As you can see, sodium has only one electron in its highest energy
level (3), and it’s in the s sub-level.This is the only electron sodium
will use to bond.
Valence Electrons
Worksheet
Valence Electrons and Electron Configuration