Homework: Element Stamp Project due
September 22 (A Day) and September 24 (B Day)
Warm Up 7: (Write the question & all answer
choices)
1. How would you find out how many protons
and atom has? Electrons? Neutrons?
2. If an atom of argon has an atomic number of
18 and an atomic mass of 39.948 how many
protons, electrons, and neutrons does it
have?
Objective: SWBAT create a model of the atomic
structure.
Element Stamp Project
• Due September 22 (A Day) & 24 (B Day)
• Make sure you follow all directions and
produce quality work.
• This is your first formal grade!
Quiz
• Please have out a sheet of paper and
something to write with.
• Write your answers on your own paper.
• Please flip your paper over when you are
done.
How many protons and neutrons are
in an atom of….
Helium
Nitrogen
Oxygen
Phosphorous
Gallium
Atomic Number: #
of protons in an
atom
Atomic Mass
(Weight): Sum
weight of protons
and neutrons
# protons + #
neutrons = Atomic
Mass
How to find the number of electrons?
• We want our atom to be neutral.
• Since protons have a positive charge, we need
to cancel them out with a negative charge
(electron).
• Because of this, we must have the same
number of protons and electrons!
How many electrons are in an atom
of….
Helium
Nitrogen
Oxygen
Phosphorous
Gallium
Atomic Basics Worksheet
• Complete # 6-11 with the person sitting next
to you.
Atomic Models
• Atomic Models are used to represent the
atomic structure of individual atoms. We will
use the Bohr Model
• This model shows the reactivity of the
element.
Bohr Model
• 1. How many protons, neutrons,
and electrons does it have?
• 2. Draw a circle to represent the
nucleus.
• 3. Use capital "P" to represent the
protons inside the nucleus. 1 "P" = 1
proton
• 4. Use capital "N" to represent the
neutrons insidethe nucleus.
1 "N" = 1 neutron
Bohr Model cont.
• 5. Draw rings around the outside of
the nucleus to represent the
electron cloud. Electrons are
represented by colored dots.
REMEMBER not to put more than
the maximum number of electrons
that each level of the electron cloud
can hold.
• Level one will hold 2 electrons
• Level two will hold 8 electrons
• Level three will hold 18 electrons
Bohr Model of Oxygen
•
•
•
•
•
Atomic Number =8
Atomic Mass = 15.999
P=
E=
N=
Bohr Model of Carbon
•
•
•
•
•
Atomic Number = 6
Atomic Mass = 12.011
P=
E=
N=
Bohr Model of Potassium
•
•
•
•
•
Atomic Number = 19
Atomic Mass= 39.098
P=
E=
N=
Bohr Model of Scandium
•
•
•
•
•
Atomic Number= 21
Atomic Mass= 44.956
P=
E=
N=
Atomic Basics Worksheet
• Complete # 1-5 with the person sitting next to
you.
• Then, flip to the back and complete the back
side.
**The electrons on the outer level are valence
electrons.
On your own:
• -List the name, symbol,
atomic number, atomic
mass, number of protons,
neutrons, electrons, and
Bohr Model for:
– Chlorine
– Calcium
– Neon
•
•
•
•
•
•
•
Name:
Symbol:
Atomic Mass:
Atomic Number:
P=
E=
N=