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ATOMIC STRUCTURE
WHAT ARE THE 3 MAJOR PARTS OF AN
ATOM?
Proton
 Neutron
 Electron

ATOM VIDEO CLIP
DESCRIBE PROTON
•Positive Charge
•Mass of 1 atomic mass unit
(amu)
•Found in the nucleus
•Equal to the atomic Number
•Determines the element
•Remember PP (Protons are
positive)
DESCRIBE NEUTRON
•No charge
•Mass of 1 amu
•Found in the nucleus
•Number of neutrons + number of
protons = mass number
•To get the number of neutrons,
mass number – atomic number
•Remember NN (No charge on
Neutrons)
DESCRIBE ELECTRON
• Negatively charged
• No mass
• Found in the electron cloud
• In a neutral atom = equal to the number
of protons
DESCRIBE NUCLEUS
The nucleus is the central part of an atom. It is
composed of protons and neutrons.
The nucleus contains most of an atom's mass.
It was discovered by Ernest Rutherford in 1911.
GATHERING INFORMATION FROM THE PERIODIC
TABLE
Element
Symbol Atomic
Number
Mass
Number
Number
of
Protons
Calcium
Boron
Zn
Rh
41
35
Sodium
Number
of
Neutrons
Number
of
Electrons
DIAGRAM SHOWING THE LOCATION OF
EACH PART OF THE ATOM.
http://www.eskom.co.za/nuclear_energy/fuel/fuel.html
DIAGRAM SHOWING THE LOCATION OF
EACH PART OF THE ATOM.
See more diagrams at:
http://www.bmb.psu.edu/courses/bisci004a/chem/basechem.htm
DIAGRAM SHOWING THE LOCATION OF
EACH PART OF THE ATOM.
http://www.bmb.psu.edu/courses/bisci004a/chem/atoms.jpg
DESCRIBE ISOTOPE
Atoms that have the same number of
protons but different numbers of
neutrons
DESCRIBE ISOTOPE
Example:
http://education.jlab.org/glossary/isotope.html
WHAT IS THE ELECTRON CLOUD MODEL?
Model of the atom pictures the electrons moving
around the nucleus in a region called an electron
cloud.
The electron cloud is a cloud of varying density
surrounding the nucleus. The varying density
shows where an electron is more or less likely to
be. Atoms with electrons in higher energy levels
have additional electron clouds of different shapes
that also show where those electrons are likely to
be.
For more information, click here:
http://regentsprep.org/Regents/physics/phys05/catomodel/cloud.htm
WHAT IS THE ELECTRON CLOUD MODEL?
DIAGRAM 1:
WHAT IS THE ELECTRON CLOUD MODEL?
DIAGRAM 2: