Wednesday, February 16, 2011 Agenda • Welcome • Announcements • Turn in Sci WB p39-40 • The atomic model: electrons & the nucleus • Lesson 1 WS (due today) • HW: Textbook p. 179:1-5 Warm Up Draw & label an atom; what are the charges of the parts? I love science
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Wednesday, February 16, 2011
Agenda• Welcome• Announcements• Turn in Sci WB p39-40• The atomic model:
electrons & the nucleus• Lesson 1 WS (due today)• HW: Textbook p. 179:1-5
Warm Up
Draw & label an atom; what are the
charges of the parts?
I love science
Warm up answerPROTON - +1
ELECTRON - -1
NEUTRON - 0
NUCLEUS - positive
Announce-mintsFebruary 14- 18
Wed - the atom; course content letter DUEThurs - the atomFri - the atomMon Feb 21st: NO SCHOOL!
History of the atomic model
Democritus “atoms are indivisible, solid spheres”
John DaltonThe Father of the Atom
How were electrons discovered?
J. J. ThomsonUsed a CATHODE RAY TUBE to discover electrons
How were electrons discovered?
Thomson’s experiment1. Turned on cathode rayThe ray flows from cathode to the anode2. Put a positive plate on top and negative plate on bottomObserved ray bend towards positive plateThe ray must have negative particles