Name
Date
Score
/50
Atomic Structure
Atomic Number = # of Protons = # of Electrons
Substance
Symbol
Atomic
Number
Mass
Number
Number of
Protons
Number of
Neutrons
32
Sulfide
20
Chloride
Mg2+
14
19
Fluoride
Na+
24
16
Phosphide
K+
39
44
Bromide
Zn2+
Oxide
Mass Number = Protons + Neutrons
64
8
Number of
Electrons
Name
Date
Score
/50
Atomic Structure
Atomic Number = # of Protons = # of Electrons
Substance
Symbol
Atomic
Number
Mass
Number
Number of
Protons
Number of
Neutrons
26
Magnesium
2
Helium
Au
122
207
Lead
F
19
42
Germanium
Li
6
20
Potassium
Br
Radon
Mass Number = Protons + Neutrons
81
133
Number of
Electrons
Name
Date
Score
/25
Atomic Structure
1. Using the following words, answer the questions below.
electrons, neutrons, nucleus, protons, shells
(a) The center of the atom is called the
(b)
have a positive charge.
.
(c)
have a negative charge.
(d)
have no charge.
(e)
and
are contained within the nucleus of the atom.
(f ) Electrons are contained in the
of an atom.
(g) The
and the
of the atom have the same mass.
2. A neutral atom has 54 protons and 70 neutrons.
(a)
(b)
(c)
(d)
What is the atomic number?
What is the mass number of the atom?
How many electrons does the atom have?
What is the name of the atom?
3. Assuming all the atoms have neutral charge, complete the following table using the information
already provided.
Protons
Atom 1
Electrons
Neutrons
30
20
24
Atom 2
Atom 3
44
Atom 5
37
Atom 6
19
50
70
12
Atom 4
Mass Number
30
43
30