Block
Name
Atomic Structure Worksheet
Label the parts of an atom on the diagram below.
4. What type of charge does a proton have?
5. What type of charge does a neutron have?
6. What type of charge does an electron have?
7. Which two subatomic particles are located in the nucleus of an atom?
8. What is the charge of an atom?
9. What is the charge of an ion?
(Explain your answer fully.)
10. If an atom has 35 protons in the nucleus, how many electrons will it
have orbiting the nucleus?
11. What is the atomic number of the atom in the diagram above?
12. What is the atomic mass/mass number of the atom in the diagram above?
13. How many protons are in the nucleus of an atom with an atomic number of 15?
14. How many electrons are in the nucleus of an atom with an atomic number of 20?
15. How many neutrons are in the nucleus of an atom with an atomic number of 25? (use Periodic Table for mass)
16. What is the mass number of an atom with 3 protons, 4 neutrons, and 3 electrons?
17. How many neutrons are in the nucleus of an atom that has an atomic mass of 36 and an atomic number of 25?
18. The atomic number tells you the number of ______________________________ in one atom of an element. It also tells
you the number of ___________________ in a neutral atom of that element. The atomic number gives the “identity” of
an element as well as it’s location on the Periodic Table.
No two different elements will have the
_______________
atomic number.
19. The mass number is used to calculate the number of _____________________ in one atom of an element. In order to
calculate the number of neutrons you must subtract the __________________ from the ___________________.
Bohr Model Drawing
Draw a Bohr model of a chlorine atom in the space below.
Be sure to place the
electrons in the correct orbitals and to fill out the key for the subatomic particles.
Protons: __________
Neutrons: _____
Electrons: _____
17
Cl
Chlorine
35.42
L
Identify the each of the parts of the box.
Atomic number equals
the number of
or
Atomic mass equals
the number of
+
Atomic# =
Atomic Mass =
# of Protons =
# of Neutrons =
# of Electrons =
Isotopes and Ions…………..
1. What is an isotope?
2. When an isotope is written with a word, a dash and a number, w hat does the number next to isotope signify?
And when there is a name with two numbers, what do these number signify? Give an example of each and label.
3. How can you tell isotopes apart?
4.
5.
Chromium-58
Chromium-63
# of protons
# of protons
# of neutrons
# of neutrons
# of electrons
# of electrons
6.
Iodine-
Iodine-
32
35
7.
# of protons
# of neutrons
113
# of electrons
55
111
# of protons
32
# of neutrons
30
32
# of electrons
1. What is an ion?
2. What does the number next to the ions signify?
ELEMENT NAME
ex
Fluorine
#OF PROTONS
ION
SYMBOL
F
-
2
9
10
53
54
16
lost one
Ca
+2
5
35
6
8
8
9
12
aluminum
gained two
lost two
10
11
12
36
+2
Sr
+
H
7
10
gained one
gained two
potassium
4
#OF ELECTRONS LOST OR GAINED
ELECTRONS
1
3
NUMBER OF
34
H
36
Complete the following chart:
a)
Number
of
Protons
Number
of
Neutrons
Number
of
Electrons
Atomic
Number
(Z)
Mass
Number
(A)
Isotope name
23
28
23
23
51
Vanadium-51
d)
e)
23
28
20
47
38
109
V

50
110
48
g)
35
22
Cd +2
81

Bromine-79
36
h)
18
46
Radium-223
j)
k)
V

f)
i)
51
23
50
23
b)
c)
Isotope
symbol
74
108
72
8
l)
16
m)
8
n)
9
Oxygen-18
127 –1
I
o)
h)
