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