Transcript 8TH PS CH 4 SEC 1 PPT

CH 4 SEC 1
INTRODUCTION TO ATOMS
GOAL/PURPOSE

PREVIOUSLY, STUDENTS LEARNED
THAT AN ATOM IS THE BASIC
PARTICLE FROM WHICH ALL
ELEMENTS ARE MADE. NOW
STUDENTS WILL EXPLORE THE
STRUCTURE OF THE ATOM AND HOW
IT WAS DISCOVERED.
ATOM




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




ELECTRONS- ARE NEGATIVELY CHARGED
PARTICLES THAT SURROUND THE
NUCLEUS(TINY)
NUCLEUS- CENTER OF THE ATOM
CONSISTING OF PROTONS AND NEUTRONS
PROTONS- POSITIVELY CHARGED
PARTICLES IN THE NUCLEUS
NEUTRONS- ARE NO CHARGE 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’…

Electrons surround the nucleus
of protons and neutrons
Another model of an atom
COPY FIG 8 in your notes




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

T
WRITE QUESTIONS AND
ANSWERS
from text ch4 sec 1
1-A
 2A,B,C
 http://www.brainpop.com/science/matteran
dchemistry/atoms/
