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Atomic Number & Mass Number Atomic number = the number of protons Mass number = the number of nucleons (protons & neutrons) A neutral atom has the same.

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Presentation on theme: "Atomic Number & Mass Number Atomic number = the number of protons Mass number = the number of nucleons (protons & neutrons) A neutral atom has the same."— Presentation transcript:

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3 Atomic Number & Mass Number Atomic number = the number of protons Mass number = the number of nucleons (protons & neutrons) A neutral atom has the same number of protons and electrons.

4 Oxygen atom

5 Sodium atom

6 Aluminium atom

7 Copper atom

8 Platinum atom

9 Gold atom

10 Lead atom

11 Radium atom

12 Uranium atom

13 Use your periodic table to find… 1.The number of protons in a carbon atom 2.The number of protons in a sodium atom 3.The number of neutrons in a sodium atom 4.The number of protons in a copper atom 5.The number of neutrons in a copper atom 6.The number of protons in a lead atom 7.The number of neutrons in a lead atom 8.The number of electrons in a lead atom

14 How many neutrons are there in a chlorine atom? Some chlorine atoms have 18 neutrons. Some have 19… They are “isotopes” of chlorine. (Chlorine–35 and Chlorine-36)

15 Example: Carbon Isotopes IsotopesProtonsElectronsNeutrons Carbon-12666 Carbon-13667 Carbon-14668

16 WORKSHEET ONE – first page only

17 Turning copper into gold?

18 Three types of Nuclear Reactions 1.Radioactive decay 2.Fusion 3.Fission

19 Uranium atom

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23 Alpha Radiation ( α particle) High-speed helium nucleus (+ve charge) two protons & two neutrons Can travel up to 10% of speed of light. Range: a few centimetres Can be stopped by a sheet of paper. Can cause serious harm but cannot penetrate skin.

24 Beta Radiation ( β particle) High-energy electron (-ve charge) Can travel up to 90% of speed of light. Range: about 30 cm Can be stopped by a sheet of aluminium about 5 mm thick.

25 Gamma Radiation ( γ Ray) Electromagnetic radiation with very high energy Occurs as a result of a nucleus being left in a very excited state immediately following other types of radioactivity. Travels at the speed of light. Can penetrate through several centimetres of dense metal such as lead.

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28 Finish WORKSHEET ONE


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