It’s Elemental!
(30 points)
Purpose: (1 pt) To practice finding protons, electrons and neutrons
Review Questions: (answer for 3 pts)
1. How do you find the number of protons?
To find the number of protons you need to look at the atomic number.
2. How do you find the number of neutrons?
To find the number of neutrons you need to take the number of protons and subtract it from the
number of neutrons.
3. How do you find the number of electrons?
To find the number of protons you look at the number atomic weight.
Part1: (10 pts)
1. Got to: http://education.jlab.org/elementmath/index.html
2. Choose the following settings:
How many questions would you like?
5
10
20
40
All Available
What would you like to be tested on?
Protons
Neutrons
Electrons
Nucleons
Should an element's atomic weight be rounded for you?
Yes
No
4. In your spiral, copy each question including the answer.
1. How many protons does an atom of
Potassium have in its nucleus? 19
2 .How many protons does an atom of
Praseodymium have in its nucleus? 59
3. How many neutrons does an atom of
Rubidium have in its nucleus? 48
4. How many neutrons does an atom of
Bromine have in its nucleus? 45
5. How many neutrons does an atom of
Californium have in its nucleus? 153
6. How many protons does an atom of
Arsenic have in its nucleus? 33
7. How many electrons surround the
nucleus of an atom of Technetium? 43
8. How many electrons surround the
nucleus of an atom of Thorium? 90
9. How many protons does an atom of
Neptunium have in its nucleus? 93
10.
How many neutrons does an atom of
Phosphorus have in its nucleus? 16
11.
How many particles are in the nucleus
of an atom of Helium? 4
12.
How many protons does an atom of
Cesium have in its nucleus? 55
13.
How many electrons surround the
nucleus of an atom of Ununseptium? 117
14.
How many electrons surround the
nucleus of an atom of Lutetium? 71
15.
How many protons does an atom of
Helium have in its nucleus? 2
16.
How many protons does an atom of
Chlorine have in its nucleus? 17
17.
How many neutrons does an atom of
Ytterbium have in its nucleus? 103
18.How many neutrons does an atom of
Vanadium have in its nucleus? 28
19. How many electrons surround the
nucleus of an atom of Germanium? 32
20.How many neutrons does an atom of
Cesium have in its nucleus? 78
Part 2: (5 pts)
1. Go to www.chemicalelements.com/elements/os.html
2. Copy the table below on to your lab (page in your spiral).
3. Click on the symbol, fill in the table. Go back to view the next symbol.
Symbol
Element
# of
# of
Property:
Property:
Name
Energy
Valence
Melting
Boiling
Levels
Electrons
Point
Point
Rb
5
1
Rubidium
38.89 °C 688.0 °C
Ca
Calcium
4
2
839.0 °C
Xe
Xenon
5
8
-111.9 °C
1484.0
°C
-108.1 °C
Br
Bromine
4
7
-7.2 °C
58.78 °C
Se
Selenium
4
6
217.0 °C
684.9 °C
Property:
Density
g/cm3
1.532
g/cm3
1.55
g/cm3
5.8971
g/cm3
3.119
g/cm3
4.79
g/cm3
Conclusion: (11 pts)
1. How do you find the number protons?
To find the number of protons you need to look at the atomic number.
2. How do you find the number of electrons?
To find the number of protons you look at the number atomic weight.
3. How do you find the number of neutrons?
To find the number of neutrons you need to take the number of protons and subtract it from the
number of neutrons.
4. What is the PEN for the element you are doing for your atom model project?
Protons: 79, Electrons: 196.966569, Neutrons: 118
5. From chemicalelements.com - click on the symbol of the element you have chosen for your atom
model project. Draw the Bohr model of the atom on your paper.