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Unit 4: Atomic Structure
4.1 The Structure of an Atom
4.1.2 Atomic Number and Mass Number
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What is an atom composed of?
Protons, neutrons, electrons
Electrons have a negative charge and are located in
orbitals
Neutrons are located in the nucleus and have a
neutral
charge.
Match the atomic component with its charge:
Proton ↔️ Positive
Neutron ↔️ Neutral
Electron ↔️ Negative
What does the atomic number (Z) represent?
Number of protons
The atomic number is crucial because it identifies the
element
Oxygen has an atomic number of 8, meaning it has 8 protons in its
nucleus
.
What is the mass number (A) of an atom?
Sum of protons and neutrons
Carbon-12 has 6 protons and 6 neutrons, resulting in a
mass number
of 12.
Steps to calculate the number of neutrons in an atom
1️⃣ Identify A and Z
2️⃣ Apply the formula
N
=
N =
N
=
A
−
Z
A - Z
A
−
Z
What are isotopes of an element?
Same protons, different neutrons
Isotopes are denoted using the format
Z
A
X
^{\text{A}}_{\text{Z}}X
Z
A
X
where
A
A
A
is the mass number, Z</latex> is the atomic number, and
X
X
X
is the element symbol.
What does the atomic number (Z) represent in an atom?
Number of protons
To find the number of neutrons (N), you subtract the atomic number (Z) from the mass number
(A)
Calculate the number of neutrons in carbon-14, where A = 14 and Z = 6.
8 neutrons
The number of neutrons in
carbon-14
is 8.
Isotopes are atoms of the same element with the same number of protons but different numbers of
neutrons
What does the symbol A represent in the isotope notation
Z
A
X
^{\text{A}}_{\text{Z}}X
Z
A
X
?
Mass number
Carbon-12 has 6 protons and 8 neutrons.
False
What are the three main components of an atom?
Protons, neutrons, electrons
Match the atomic component with its properties:
Protons ↔️ +1 charge, nucleus
Neutrons ↔️ 0 charge, nucleus
Electrons ↔️ -1 charge, orbitals
Where are electrons located in an atom?
Orbitals around the nucleus
The atomic number of oxygen is 8, which means it has 8
protons
The atomic number is unique for each
element
.
What is the mass number (A) of an atom equal to?
Protons + neutrons
What is the mass number of carbon-12, which has 6 protons and 6 neutrons?
12
The mass number is the same for all isotopes of an element.
False
How do you calculate the number of neutrons in an atom using its mass number (A) and atomic number (Z)?
N = A - Z
To find the number of neutrons, you subtract the atomic number from the mass
number
The atomic number uniquely identifies an
element
.
What is the atomic number and mass number of helium, as shown in the example?
Z = 2, A = 4
Calculate the number of neutrons in sodium, which has an atomic number of 11 and a mass number of 23.
12 neutrons
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