Presentation on theme: "F. Schifano, Teacher of Chemistry Department of Science, Bayonne High School, Bayonne NJ."— Presentation transcript:
F. Schifano, Teacher of Chemistry Department of Science, Bayonne High School, Bayonne NJ
Five Days of Instruction and Practice One Laboratory: Electron Configuration (2.5 Points) One Day of In-Class Review Afterschool Session Thursday, 10 February 2011 One Full-Chapter Test (13 points)
NJCCCS 2009 Standards 5.2.12.A.1 (Electrons…are part of the atom and have measurable properties including mass…and charge…) NJCCCS 2009 Standards 5.2.12.B.1 (An atom’s electron configuration, particularly of the outermost electrons, determines how the atom interacts with other atoms…)
The configuration of electrons, especially valence electrons, determines the chemical properties of substances and the kinds of bonds they form. Electrons arrange themselves in particular, predictable ways as a simple result of the electromagnetic energy they possess.
Describe electrons in detailWrite electron configurationsUse electron configurations
An electron (e - ) is a tiny sub-atomic particle with a negative charge. It’s also the smallest unit of electric charge. The beta particle released in beta decay is an electron.
Small m e =9.1 × 10 -31 kg A trillion trillion billion weigh the same as a chem book Quick Travel at 99.999% speed of light So fast they make a blur around the atom Clones Have no smaller parts inside Only way to tell them apart is by describing their energy and location
Electrons occupy a region around the nucleus called the electron cloud. They’re so quick it’s impossible to tell exactly where they are at any moment. This idea is called Heisenberg’s Uncertainty Principle.
Electrons are the way chemicals react! Atoms trade or share electrons, forming bonds. By studying them we can figure out why chemicals react (or why they don’t) and what the likely products will be. Some other phenomena feature electrons too.
Chemicals react in whatever way makes them more stable. They do this by sharing or exchanging electrons.
Some configurations of electrons are more stable than others, and atoms will try to obtain these configurations.
Situations in which atoms can cooperate to help each other reach stable configurations are likely reactions. Some atoms want electrons. Others want to give electrons away.
What is an electron? Why should we care about electrons? What are the properties of the electron? What do electrons determine about an atom? Where are electrons found? What is Heisenberg’s Uncertainty Principle?