1) Explain the following terms briefly:
a) chemical change:
 

b) isotopes:

c) gamma rays

2) Calculate the density in g/mL of a solid block of metal which has length of 4 cm, width of 2.5 cm and height of 3 cm and weighs 1.15 kg.
 
 
 
 
 
 
 

3) Identify potassium from the periodic table and answer the following questions:
a) write the electronic configuration of potassium:
 
 

b) how many electrons, protons and neutrons does potassium have?
 
 

c) what group does it belong to?
 
 

4) Balance the following nuclear equation:
            ²³⁵U₉₂    +    ¹n₀          =      ⁸⁸Sr       +     Xe    +        3¹n₀

What is the particle released? give two of its properties.

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