Save
...
Topic 1: Atomic Structure and the Periodic Table
1.1 Atomic Structure
1.1.2 Isotopes
Save
Share
Learn
Content
Leaderboard
Share
Learn
Cards (38)
What are isotopes defined as?
Atoms of the same element with the same number of protons but different numbers of neutrons
Isotopes of the same element have the same number of protons but a different number of
neutrons
The number of protons in an isotope is equal to its
atomic number
How is the relative atomic mass of an element determined using isotopic abundance?
By calculating the weighted average of the masses of its isotopes
Isotopes have applications in fields such as
medicine
and archaeology.
Match the isotope of hydrogen with its symbol:
Protium ↔️ H-1
Deuterium ↔️ H-2
Tritium ↔️ H-3
What is the formula to calculate the number of neutrons in an isotope?
N
e
u
t
r
o
n
s
=
Neutrons =
N
e
u
t
ro
n
s
=
M
a
s
s
N
u
m
b
e
r
−
A
t
o
m
i
c
N
u
m
b
e
r
Mass\ Number - Atomic\ Number
M
a
ss
N
u
mb
er
−
A
t
o
mi
c
N
u
mb
er
The number of protons in an isotope is equal to its mass number
False
For neutral atoms, the number of electrons is equal to the number of
protons
.
What is the symbol for the isotope Protium?
H-1
How many neutrons are in the isotope Deuterium?
1
How is the number of protons in an isotope determined?
Atomic number
For neutral atoms, the number of electrons is equal to the number of
protons
What is the number of protons in Carbon-14?
6
How many neutrons are in Carbon-14?
8
The number of electrons in Carbon-14 is
6
.
What is the formula to calculate the relative atomic mass using isotopic abundance?
A_{r} = \sum (\% \text{ abundance} \times \text{ mass of isotope}) / 100</latex>
The relative atomic mass of chlorine is
35.48 u
Which isotope is used in medicine for cancer treatment?
⁶⁰Co
Carbon-14 is used in archaeology for
radiocarbon
dating.
Match the isotope with its application:
¹²⁵I ↔️ Thickness gauges
²⁴¹Am ↔️ Smoke detectors
¹³¹I ↔️ Diagnostic imaging
Isotopes are atoms of the same element with the same number of protons but different numbers of
neutrons
The number of neutrons affects the atomic mass of an
isotope
.
What is the main difference between isotopes of the same element?
Number of neutrons
The number of protons in an atom is equal to its
atomic number
How is the number of neutrons calculated in an isotope?
M
a
s
s
N
u
m
b
e
r
−
A
t
o
m
i
c
N
u
m
b
e
r
Mass\ Number - Atomic\ Number
M
a
ss
N
u
mb
er
−
A
t
o
mi
c
N
u
mb
er
In a neutral atom, the number of electrons is equal to the number of
protons
.
To calculate the number of protons in an isotope, you refer to the
atomic number
What formula is used to calculate the number of neutrons in an isotope?
M
a
s
s
N
u
m
b
e
r
−
A
t
o
m
i
c
N
u
m
b
e
r
Mass\ Number - Atomic\ Number
M
a
ss
N
u
mb
er
−
A
t
o
mi
c
N
u
mb
er
For neutral atoms, the number of electrons is always equal to the number of
protons
.
The first step in determining the relative atomic mass using isotopic abundance is to list all isotopes with their masses and
abundances
What formula is used to calculate the relative atomic mass of an element using isotopic abundance?
A
r
=
A_{r} =
A
r
=
∑
(
%
abundance
×
mass of isotope
)
/
100
\sum (\% \text{ abundance} \times \text{ mass of isotope}) / 100
∑
(
%
abundance
×
mass of isotope
)
/100
Calculating the weighted average is the final step in determining relative atomic mass using
isotopic abundance
.
In the example for chlorine isotopes, the mass of Chlorine-35 is
35
What is the relative atomic mass of chlorine calculated using the given isotopic abundances?
35.48 u
Iodine-131
is used in medicine for cancer treatment and diagnostic imaging.
Carbon-14 is used in archaeology for
radiocarbon dating
What are two isotopes used in industry for measuring thickness and density?
Iodine-125 and Americium-241