5 isotopes
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Transcript of 5 isotopes
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Isotopes
Objectives:5.2 To identify the advantages & disadvantages of using isotopes in industry, medical science, basic research & in the environment
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Are atoms of the same element, but have a different number of neutrons
ex. Carbon can have 6 or 8 neutrons
Isotopes:
C 12
6 C 14
6
6 neutrons 8 neutrons
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Have the same number of protons & electrons
Have the same atomic number
Have the same chemical reactivity
Isotopes:
C 12
6 C 14
6
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What statement is false?
A) Isotopes have the same number of protons
B) Isotopes have the same number of neutrons
C) Isotopes have the same number of electrons
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Given the three hypothetical atoms below, which are isotopes of the same element?
A 10
6 B 10
5 C 12
6
Different # neutronsSame # protons
4 neutrons 5 neutrons 6 neutrons
6 protons 5 protons 6 protons
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According to the graph below, how many isotopes of nitrogen (N) are there?
Atomic Number
Ato
mic
Mass
7 85 6
12
13
14
15
Different # neutronsDifferent Atomic MassSame Atomic Number
Find atomic number of N Trace up – each point represents an isotope
2 isotopes
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According to the graph below, what is the atomic mass of each isotope of oxygen?
Number of Protons
Nu
mb
er
of
Neu
tron
s
9 107 8
7
8
9
10
Find the number of protonsTrace up – each point represents an isotope
3 isotopes
Trace along & find the number of neutrons for each isotope
Add the number of protons & neutrons together for each isotope
Atomic mass = 18
Atomic mass = 17
Atomic mass = 16
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Occur naturally in nature & are made artificially
Most natural isotopes are stable
Some natural & artificial isotopes are unstable When unstable, release radiation
(radioisotopes)
Isotopes:
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Unstable isotopes (radioisotopes) can be used for: Cancer therapy Medical diagnosis Nuclear power plants Irradiation of foods Research Environment
Radioisotopes:
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Isotopes are atoms of the same element, but with a different number of neutrons
Same atomic number, number of protons & electrons and chemical reactivity
Natural isotopes tend to be stable
Artificial isotopes are not stable & can release radiation
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Activities:
Physical Science Worksheet #9
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References
Student Study Guide – Physical Science 416/436 - MEQ
Science Quest – Grenier, Daigle, Rheaume – 1998, Cheneliere
Google Images Animation Factory