1. Today in Science
You will Need:
2)Pencil, Colored Pencils, Highlighters or
Markers
3)Power Notes – Atomic Structure– 2 page 4
sides- Picked up yesterday(Wed.)
4)Signed Progress Notice– Due NOW

2. Quick Writes will not be grade for points
but for participation and honesty.
3. You are allowed to use your brain,
any notes, labs or worksheets we
have done in class.
4. You may not use your textbook or
interactive reader.
5. You will have 10 minutes to complete
as many questions as possible.
6. With a colored pencil, you will grade

3. Basic Atomic Structure Today scientists agree on the
three basic subatomic particles
that make up all atoms.
Bohr Model for Lithium
(not to scale) Electron = 3
P= 3 +
N = 3 0
Where is most of the mass in the NUCLEUS
Atom?
Where is most of the volume in the Outside the Nucleus; Electron
Atom? Cloud

4. Nucleus • Contains protons(+) and
Neutrons (0)
• Holds most of the mass of
the atom
• Very small compared to the
entire size of the atom
• Most dense part of the atom
Electron • Negatively charged
subatomic particle
• Found outside the nucleus in
the electron cloud
• Smallest particle; mass =
1/1836th of the atom

5. Proton • Positively charged subatomic particle
• Found in the nucleus
• Mass = 1 amu (atomic mass unit)
• # of protons in an atom IDENTIFIES the
atom (which element)
• # of protons in the nucleus of an atom
called the atomic number
Neutron • Zero charge
• Mass = 1 amu
• Do NOT affect the identity of the atom
• Found in the nucleus
• Same atom of an element can have
varying amounts of neutrons (isotope)
• Adding the total number of protons &
neutrons = Atomic Mass Number
http://www.sawyerscience.com/Units/unit2/atoms_compounds.html

6. All atoms found on the • Neutral – same # of protons(+) and
Periodic Table are # of electrons(-)
Isotope • Atoms of the same element with
same number of protons and
different number of neutrons.
nucleus nucleus
Proton
Hydrogen has 3 natural
occurring ISOTOPES:
Protium, Deuterium and Protium nucleus Deuterium
Tritium
are Neutro
All ROGEN have n
l
HYD use al Tritium
a
bec oton.
r
1 p

7. Atomic MASS • On the Periodic Table represents a
weighted average of the mass of all
naturally occurring isotopes of each
element. (based on mass and
abundance of each isotope).
• When atoms gain or lose electrons
IONS
they become charged. (number of
protons (+) and electrons (-)
particles are NOT EQUAL)
REVIEW & REFLECT + -

8. Coloring the Periodic • Outline each box in the following
Table way:
3. Metalloids – in BLUE
4. Nonmetals – in ORANGE
*Textbook pg 196-197 – Use the 5. Metals – in GREEN
key

9. Homework
1)Power Notes– Due Monday –Date
Change (There is time to work in
class tomorrow)
Do You see HOW the periodic table
and the Atomic Structure are
RELATED?