MAIN IDEAS 1.Electrons 2.Cathode Ray 3.Protons 4.Neutrons 5.Nucleus KEY CONCEPTS 1.What are the...
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Transcript of MAIN IDEAS 1.Electrons 2.Cathode Ray 3.Protons 4.Neutrons 5.Nucleus KEY CONCEPTS 1.What are the...
4.2 Structure of the Nuclear AtomMAIN
IDEAS1. Electrons2. Cathode
Ray3. Protons4. Neutrons5. Nucleus
KEY CONCEPTS1. What are the kinds
of subatomic particles?
2. How can you describe the structure of the nuclear atom?
IaN pg. 5
2
Electron Cloud
REGIONS
PARTICLES
Neutron
Nucleus
ProtonElectron
I. Subatomic ParticlesA. Protons (+), Electrons (-), Neutrons (0) B. Change to Dalton’s Theory = atoms are divisible!
1. In 1897 JJ Thomson (1856 – 1940) discovered that atoms contain tiny, negatively charged particles called electrons using the Cathode Ray Experiments.
Negatively Charged Beam
Positively charge plates
Watch what happens when the magnet is placed above and below the electron beam.
D. Robert Milikan (1868-1953) 1. U.S. Physicist 2. Experiments quantity of
chargea. Thomson’s ratios
calculates mass of electron (1916)
3. One unit of negative charge & 1/1840 the mass of a Hydrogen atom
Why a Hydrogen atom?
1. 1932 – Eugene Goldstein (1850 – 1930)
a. Evidence of positively charged particles using Cathode Ray = Protons
b. Mass 1840 X an electron
2. 1932 James Chadwick, English Physicist (1891 -1974) discovers the neutron.
a. No Chargeb. Mass nearly = to proton
How are the subatomic particles arranged?
1. 1911, Ernest Rutherford (1871 -1937) provided evidence that the atom is mostly empty space. He named, nucleus = small dense (+) charged center.
a. Gold Foil Experiment – Alpha particles passing through & deflected by gold foil
Dalton’s Model
“Solid Sphere”
Thomson’s Model
“Plum Pudding”
“Solar System”
Rutherford’s
Model
NUCLEAR ATOM – Protons & Nuetrons in the nucleus. Electrons take up most of the volume
ORANGE
CARD
GREEN CARD #
NOTES = NTEXTBOOK
= T w/ PAGE
#
MISSED GREEN
CARD #’s
% CORREC
T
15 = N3
Card Sort Activity
Top ½ IaN pg. 4INFERENCE REFERENCE