Isotopes

Isotopes

• 1.
  Isotopes Objectives: 5.2 To identifythe advantages & disadvantages of using isotopes in industry, medical science, basic research & in the environment
• 2.
   Are atomsof 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
• 3.
   Have thesame number of protons & electrons  Have the same atomic number  Have the same chemical properties  Have DIFFERENT physical properties  E.g Density Isotopes: C 12 6 C 14 6
• 4.
  What statement isfalse? A) Isotopes have the same number of protons B) Isotopes have the same number of neutrons C) Isotopes have the same number of electrons
• 5.
  Given the threehypothetical atoms below, which are isotopes of the same element? A 10 6 B 10 5 C 12 6 Different # neutrons Same # protons 4 neutrons 5 neutrons 6 neutrons 6 protons 5 protons 6 protons
• 6.
  According to thegraph below, how many isotopes of nitrogen (N) are there? Atomic Number AtomicMass 7 85 6 12 13 14 15 Different # neutrons Different Atomic Mass Same Atomic Number Find atomic number of N Trace up – each point represents an isotope 2 isotopes
• 7.
  According to thegraph below, what is the atomic mass of each isotope of oxygen? Number of Protons NumberofNeutrons 9 107 8 7 8 9 10 Find the number of protons Trace 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
• 8.
   Occur naturallyin nature & are made artificially  Most natural isotopes are stable  Some natural & artificial isotopes are unstable  When unstable, release radiation (radioisotopes) Isotopes:
• 9.
   Unstable isotopes(radioisotopes) can be used for:  Cancer therapy  Medical diagnosis  Nuclear power plants  Irradiation of foods  Research  Environment Radioisotopes:
• 10.
   Isotopes areatoms 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
• 11.
  Activities:  Workbook, page9  Q 15, 16,17, 19  Worksheet #9