Chapter 4 Study Guide
For each of the statements below, write True or False.
___False___ 1. The number of neutrons in an atom is referred to as its atomic number
____True__ 2. The periodic table is arranged by increasing atomic number
___True___ 3. The atomic number is equal to the number of electrons in an atom
___True___ 4. The number of protons in an atom identifies it as an atom of a particular element
___False___ 5. Most atoms have either a positive or a negative charge
Answer the following questions.
6. Lead has an atomic number of 82. How many protons and electrons does lead have?
82 Protons and 82 Electrons
7. Oxygen has 8 electrons. How many protons does oxygen have?
8 Protons
8. Zinc has 30 protons. What is its atomic number?
30
9. Astatine has 85 protons. What is its atomic number?
85
10. Rutherfordium has an atomic number of 104. How many protons and electrons does it
have?
104 protons, 104 electrons
11. Polonium has an atomic number of 84. How many protons and electrons does it have?
84 protons, 84 electrons
12. Nobelium has an atomic number of 102. How many protons and electrons does it have?
102 protons, 102 electrons
Determine the number of protons, electrons, and neutrons for each isotope described
below.
13. An isotope has atomic number 19 and mass number of 39
P-19, E-19, N-20
14. An isotope has 14 electrons and a mass number of 28
p-14, e-14, n-14
15. An isotope has 21 neutrons and a mass number of 40
p-19, e-19, n-21
A World-Famous Table
Atomic number
1
H
Hydrogen
1
Au
______1_____
Atomic mass
Gold
_____1______
_
197
Element Name
12
79
Atomic Mass
28
Mg
__Magnesium
Ni
Magnesium
Atomic number
Nickel
24
Fe
59
______12___
# protons
26
11
Na
_______26___
Iron
Element Symbol
Sodium
56
_______Fe_____
23
Atomic number
5
B
Boron
11
_____5____
Element Name
______boron
# Electrons
_____79_______
# Protons
_____79_______
# Atomic Number
_______79_____
Element Name
___Gold_____
78
Pt
Platinum
195
Pb
Atomic number
29
_______117__
______82____
__
# Electrons
91
88
# Neutrons
207
Zirconium
Element Symbol
______Na_____
# Neutrons
_____12______
Element Name
___Sodium_
_____78_____
# protons
Zr
______Ni___
____Lead__
Lead
40
__59________
Symbol
Element name
82
___40_______
Atomic Mass
________91__
Atomic number
Ra
______88____
Radon
# Neutrons
226
_____138__
Atomic mass
Cu
Copper
64
_____64____
# Neutrons
______35____
Protons, Neutrons, and Electrons Practice Worksheet
Fill in the blanks in the following worksheet. Please keep in mind that the isotope represented by
each space may NOT be the most common isotope or the one closest in atomic mass to the value
on the periodic table.
Atomic
Symbol
B
Na
Ga
Y
Cu
Tc
Pb
Yb
Ac
Mo
Tl
Fm
No
Yb
Sg
Atomic
number
5
11
31
39
29
43
82
70
89
42
81
100
102
70
106
Protons Neutrons Electrons
5
11
31
39
29
43
82
70
89
42
81
100
102
70
106
6
13
37
50
35
143
125
102
136
53
125
159
159
100
159
6
11
31
39
29
43
82
70
89
42
18
100
102
70
106
Atomic
Mass
11
24
68
89
64
100
207
172
225
95
206
259
261
172
265
Which Atom Is Which?
(Hint: White dots are Protons)
Every kind of atom has its own unique look. All the atoms of an element have this same look.
Here’s a chance for you to look at some atoms and tell what elements they are. Write the name of
the element next to each atom. You may need to use the periodic table to help you out.
A. Carbon
D. Oxygen
G. Lithium
B. Neon
E. Helium
H. Nitrogen
C. Boron
F. Hydrogen
I. Beryllium