Download Isotopes Nov. 14

11/14/2011
Isotopes
Nov. 14
42
ISOTOPES Examples:
Hydrogen has 3 isotopes (all
have 1 proton; same
atomic number)
• Protium has 0 neutrons
• Deuterium has 1 neutrons
• Tritium has 2 neutrons
45
Hydrogen isotopes
Calculate the mass number for each one
then identify which one is the most
abundant isotope.
1) 1p+
0 n0
1 e-
2) 1p+
1 n0
1 e-
3) 1p+
n0
1 e-
2
43
ISOTOPES
Can be written two different
ways. Below is one way
name - mass #
• Hydrogen-1
• Hydrogen-2
• Hydrogen-3
44
Hydrogen isotopes
Hydrogen-1 means
this isotope of hydrogen
has:
•
•
•
•
•
Mass number = __
# of protons = __
# of neutrons = __
# of electrons = __
# of nucleons = __
Hydrogen-2 means
this isotope of hydrogen
has:
•
•
•
•
•
Mass number = __
# of protons = __
# of neutrons = __
# of electrons = __
# of nucleons = __
46
47
ISOTOPES: Answer the following questions using your notes about isotopes
Hydrogen-3 means
this isotope of hydrogen has:
•
•
•
•
•
Isotopes of Hydrogen
Isotopes:
are atoms of an element that have the same
number of protons(atomic number) as other
atoms of the same element but a different
number of neutrons.
• Most elements have isotopes; some do not.
•
1) What are isotopes?
1.What are isotopes?
Mass number = ___
# of protons = ___
# of neutrons = ___
# of electrons = ___
# of nucleons = ___
2. How does protium differ from
deuterium?
48
3. How are protium and
deuterium alike?
49
answer: isotopes are atoms
with the same number of
protons but a different
number of neutrons in the
nucleus
50
1
11/14/2011
2) How does protium differ
from deuterium?
3) How are protium and
deuterium alike?
Hydrogen isotopes
Directions: Fill in the following chart.
Mass #
Neutrons
Nucleons
Electrons
Boron-10
answer: Protium has zero
neutrons while deuterium
has one neutron
B-11
answer: Both have one
proton in the nucleus
51
52
Isotopes
1) List the number of protons & neutrons for
each atom below.
a) Oxygen-16
Isotopes of the same
b) Oxygen-17 element
c) Oxygen-18
d) Hydrogen -1
of the same
e) Hydrogen -2 Isotopes
element
f) Hydrogen -3
Protons
Fill in the
following
chart
Mass number Protons
Neutrons
53
ISOTOPES
nucleons
A second way is called the nuclear symbol:
Carbon – 12
Carbon -13
Number of nucleons
Carbon - 14
54
Isotopes: nuclear symbol for carbon isotope
Must be given to you
Mass
number
Atomic
number
Element
symbol
12
6
C
Found on periodic table
57
56
55
Isotopes:
practice writing nuclear symbols for the following
isotopes
a)
b)
c)
d)
Isotopes: ANSWER KEY
practice writing nuclear symbols for the following
isotopes
Chlorine-35
Carbon-14
Oxygen-17
Silver-108
35
17
Cl
17
8O
58
14
6
C
108
Ag
47
59
2
11/14/2011
Learning Check
•Naturally occurring carbon consists of three isotopes,
•Sometimes bottom number is not written because you can get it
from the periodic table; insert the bottom number for each symbol
•State the number of protons, neutrons, and electrons in each of
the following.
20Ne
21Ne
COMPLETE THE FOLLOWING
ELEMENT
NAME
Isotope notation
(NUCLEAR SYMBOL)
PROTONS
NEUTRONS
MASS NUMBER
LITHIUM-6
4) Write the isotope symbol for two
nitrogen atoms, one with a mass # of
15 and the other with a mass # of 14
22Ne
S-33
protons
neutrons
Helium-3
electrons
60
Isotopes: complete the following chart
Number
of
protons
Number of
electrons
Number of
neutrons
Number of
nucleons
Nuclear
isotope
61
Helium-3
Learning check
Isotopes
Indicate the number protons, neutrons, and
electrons for the following nuclear symbols:
79
35
Hydrogen-2
Br
238
92
Directions: Take out a clean sheet of paper. I will
assign you a letter A or B. If you are in a
group A do only A; if you are in group B do
only B
A) Write both notations for the following isotope:
Argon with a mass number of 38
u
1
H
1
Lithium-7
62
Beryllium-9
B) Write both notations for the following isotope:
Neon with a mass number of 22
Boron-11
63
64
65
ISOTOPE ASSIGNMENT; answer each question on a separate sheet; you do not need to
write out the questions; staple your answers to this sheet.
Name ______________________________________ hr________
1.
Define isotope.
Fill in the Blank
2.
____ is the sum of the number of protons and neutrons of the nucleus of an atom.
3.
___ is a small positively charged subatomic particle in the nucleus; the number of
these particles determines the identity of an element.
4.
___ is the number of protons and this number is the same for all atoms of that
element.
5.
___ is the sum of the number of protons and neutrons of the nucleus of an atom.
6.
___ is a subatomic particle in the nucleus with no charge.
7.
___ is a subatomic particle with a negative charge.
8.
___ is an atom’s central region, which is made up of protons and neutrons.
9.
What’s the difference between atomic number and mass number?
10.
___ is the mass of atoms expressed in atomic mass units (amu).
11.
True or False. Isotopes are two atoms of the same element.
12.
True or False. Isotopes are two atoms of different elements.
13.
Atom A has 6 protons and 6 neutrons. Atom B has 6 protons and 7 neutrons. Are
atoms A and B isotopes?
14.
Atom C has 6 protons and 6 neutrons. Atom D has 7 protons and 6 neutrons. Are
atoms C and D isotopes?
15.
Circle the items below that can found on the periodic table:
66
Atomic number
atomic mass mass number
3