Transcript CH 4 SEC 1 - Santee School District / Overview

CH 4 SEC 1
INTRODUCTION TO ATOMS
GOAL/PURPOSE
WE HAVE LEARNED THAT THE
UNIVERSE IS HUGE AND EXPANDING.
 NOW WE WILL FOCUS ON WHAT IT IS
MADE OF AND HOW MATTER,
MATTERS…..
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ATOM
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ATOM- IS THE SMALLEST PARTICLE OF AN
ELEMENT.
KEY- YOU CANT SEE AN ATOM.
KEY- THE ATOMIC THEORY GREW AS A
SERIES OF MODELS THAT DEVELOPED
FROM EXPERIMENTAL EVIDENCE.
KEY- AS MORE EVIDENCE WAS
COLLECTED, THE THEORY AND MODELS
WERE REVISED
COPY FIG 2 DALTONS IDEAS
p.125
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ELECTRONS- ARE NEGATIVELY CHARGED
PARTICLES THAT SURROUND THE
NUCLEUS
NUCLEUS- CENTER OF THE ATOM
CONSISTING OF PROTONS AND NEUTRONS
PROTONS- POSITIVELY CHARGED
PARTICLES IN THE NUCLEUS
Neutron's- ARE NO CHARGE particles BUT
SIMILAR MASS TO PROTON. Located in the
nucleus.
COPY FIG 7 THE MODERN
MODEL OF AN ATOM
KEY- AT THE CENTER OF THE ATOM IS
A TINY, MASSIVE NUCLEUS
CONTAINING PROTONS AND
NEUTRONS .
 KEY- SURROUNDING THE NUCLEUS IS
A CLOUDLIKE REGION OF MOVING
ELECTRONS. Also called the ‘electron
cloud’…
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Electrons surround the nucleus
of protons and neutrons
Another model of an atom
COPY FIG 8 p.129 in your
notes
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KEY- ATOMS ARE AMAZINGLY SMALL. THE
TINIEST SPECK OF DUST MAY CONTAIN
10MILLION BILLION ATOMS!
ATOMIC NUMBER- THE NUMBER OF
PROTONS IN THE NUCLEUS OF AN ATOM.
KEY- EVERY ELEMENT HAS A DIFFERENT
NUMBER OF PROTONS. The number tells us
how many protons are in the element
EX- CARBON ATOMIC# IS 6 HOW MANY
PROTONS? OXYGEN ATOMIC# IS 8PROTONS? IRON AT #26- PROTONS?
Check these sites for more on
the periodic table
http://periodictable.com/
 http://www.chemicalelements.com/
 http://science.howstuffworks.com/periodictable-videos-playlist.htm
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ANSWER QUESTIONS from
text ch4 sec 1
p.130
1-A,B,C
 2-A,B,C
 http://www.brainpop.com/science/matteran
dchemistry/atoms/
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