Unit 3: Atoms and Elements – Atomic Models Lab
Cooking up Elements!
name:_______________________
period: ______________ ________
Background Information:
_____
H
1.. Use the periodic table to determine the number of protons, electrons and neutrons in neutral
atoms:
__ Hydrogen___
_______
Atomic Number = # of protons & #electrons
Mass Number – Atomic Number = # of neutrons
Amount of electrons each energy level
can hold:
P = _________
N = _________
1st – 2 electrons
2nd- 8 electrons
3rd- 18 electrons
E = _________
Question/Purpose:
The purpose of this lab is:
* Model the basic structure of an atom.
* Use the periodic table to determine the number of protons, neutrons and electrons in different atoms.
* Understand how mass and charge of protons, neutrons and electrons determines atomic mass and atomic neutrality.
* Understand why scientists use models.
Procedure:
Supply list:
10 purple beads = protons
3 small pipe cleaners = nucleus
12 green beads = neutrons
10 black beads = electrons
3 medium pipe cleaners = 1st energy level
2 long pipe cleaners = 2nd energy level
1) Complete Columns 1 and 2 in Data Table 1 for Lithium.
2) Make a model of a Lithium atom:
a) Combine protons and neutrons in one cluster using small pipe cleaner to form the nucleus.
b) Make the correct number of energy levels (create circles with the pipe cleaners) and place the electrons on the pipe cleaners.
3) Draw your Lithium atom in data table 1. Don’t forget to label your drawing with protons, neutrons, electrons and nucleus!
4) Do the same for Helium & Boron.
5) When models & data charts are completed for all 3 atoms, raise your hand so I can sign off on your atoms and give you the
conclusion worksheet.
6) Answer the conclusion questions. This will be stapled to this worksheet when everything is completed and turned in to the basket.
Unit 3: Atoms and Elements – Atomic Models Lab
name:_______________________
period: ______________ ________
Observations/Data:
Data Table 1: Lithium Atom
Complete the Periodic Table
_____
Li
Find Number of Protons, Neutrons
and Electrons
Drawing
P = _________
N = _________
______________
_______
E = _________
Data Table 2: Helium Atom
Complete the Periodic Table
_____
______________
_______
Find Number of Protons, Neutrons
and Electrons
Drawing
P = _________
N = _________
E = _________
Data Table 3:Boron Atom
Complete the Periodic Table
Find Number of Protons, Neutrons
and Electrons
_____
P = _________
______________
N = _________
_______
E = _________
Teacher check:
Drawing
Unit 3: Atoms and Elements – Atomic Models Lab
name:_______________________
period: ______________ ________
Conclusion Questions: (Answer in full sentences)
1.
Are atomic models accurate representations of real atoms? Explain why or why not.
2.
Describe how you determine the number of electrons in an atom.
3.
Describe how you determine the number of neutrons in an atom.
4.
Describe how you determine the number of protons in an atom.
5. Explain why the larger beads represent the protons and neutrons and the smaller beads represent the electrons.
4
I can fully illustrate and
explain the modern atomic
model and can explain the
importance of testing and
adapting models within
science.
3
I can illustrate and explain
the modern atomic model
and how it has changed over
time.
2
I can illustrate the 3 major
parts (protons, neutrons, and
electrons) of the modern
atomic model.
1
With help I can illustrate the
3 major parts (protons,
neutrons, and electrons) of
the modern atomic model.
0
Even with help I cannot
illustrate the 3 major parts
(protons, neutrons, and
electrons) of the modern
atomic model.
Unit 3: Atoms and Elements – Atomic Models Lab
name:_______________________
period: ______________ ________
Extension: How far away are electrons from the nucleus?
Background: The typical atom has a diameter of 10-10 meters. The typical nucleus has an average diameter of 10-15
meters. This means, that on average, an atom has a diameter that is 105 or 100,000 times bigger than its nucleus!
600 m
Using a ruler and this scale, determine where in Boulder electrons would be using objects in the classroom as nuclei.
Draw and label your atomic radius on the map above.
Object: Pencil Eraser
- diameter = 0.6 cm
Object: ___________
- diameter =
Object: ___________
- Diameter =
Atomic radius:
100,000 x 0.6 cm = 60,000 cm
Atomic radius:
Atomic Radius:
1𝑚
60,000 x 100 𝑐𝑚 = 600 m