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Chapter 4: The Structure of the Atom

Practice Test
      
  1.What isotope has seven protons and six neutrons?  
  a.   carbon-7  
  b.   nitrogen-7  
  c.   carbon-13  
  d.   nitrogen-13  
  Hint    
      
  2.How many protons are present in an atom potassium-39?  
  a.   58  
  b.   19  
  c.   39  
  d.   20  
  Hint    
      
  3.What is the charge of a gamma ray?  
  a.   1+  
  b.   2+  
  c.   0  
  d.   1–  
  Hint    
      
  4.The sum of the protons and neutrons in a nucleus is __________?  
  a.   the mass number  
  b.   the atomic number  
  c.   Avogadro’s number  
  d.   the element number  
  Hint    
      
  5.What is the negatively—charged particle in an atom?  
  a.   proton  
  b.   positron  
  c.   neutron  
  d.   electron  
  Hint    
      
  6.What is the charge of a beta particle?  
  a.   0  
  b.   1–  
  c.   2+  
  d.   1+  
  Hint    
      
  7.What is the name for atoms of an element that have different masses?  
  a.   isomers  
  b.   isotopes  
  c.   allotropes  
  d.   alloforms  
  Hint    
      
  8.What is the smallest particle of an element that maintains the properties of the element?  
  a.   molecule  
  b.   mixture  
  c.   cation  
  d.   atom  
  Hint    
      
  9.Which of the following statements is correct?  
  a.   A proton is about 2000 times more massive than an electron.  
  b.   A neutron will always be found orbiting the nucleus.  
  c.   An electron is about 2000 times more massive than a proton.  
  d.   The nucleus is mostly empty space.  
  Hint    
      
  10.What is the primary factor in determining an atom’s stability?  
  a.   neutron to proton ratio  
  b.   alpha particle to beta particle ratio  
  c.   neutron to electron ratio  
  d.   proton to electron ratio  
  Hint    
      
  11.How do gamma rays differ from alpha particles and beta particles?  
  a.   Alpha particle and beta particle emissions result in the formation of new atoms, whereas gamma ray emissions do not.  
  b.   Gamma rays and alpha particles result in the formation of new atoms, but beta particles do not.  
  c.   Gamma rays have mass, whereas alpha and beta particles do not.  
  d.   Gamma rays and beta particles result in the formation of new atoms, but alpha particles do not.  
  Hint    
      
  12.How is the atomic mass unit (amu) defined?  
  a.   1/16 the mass of an oxygen-16 atom  
  b.   1/14 the mass of a nitrogen-14 atom  
  c.   1/12 the mass of a carbon-12 atom  
  d.   1/13 the mass of a carbon-13 atom  
  Hint    
      
  13.An atom of an element contains eight electrons. What is the identity of this element?  
  a.   carbon  
  b.   fluorine  
  c.   nitrogen  
  d.   oxygen  
  Hint    
      
  14.Which of the following particles has a mass that is almost the same as the mass of a proton?  
  a.   positron  
  b.   beta particle  
  c.   electron  
  d.   neutron  
  Hint    
      
  15.What is the name for the emission of rays and particles by a radioactive material?  
  a.   radiation  
  b.   nuclear reactivity  
  c.   radioactive series  
  d.   decay  
  Hint    
      
  16.Which of the following is true for any atom?  
  a.   atomic number = number of protons = number of electrons  
  b.   mass number = number of protons = number of electrons  
  c.   atomic number = number of neutrons = number of electrons  
  d.   mass number = number of protons = number of neutrons  
  Hint    
      
  17.Which of the following is a correct statement about a neutral atom?  
  a.   The atom is radioactive.  
  b.   Neutrons are present in the nucleus.  
  c.   The atom has the same number of proton and electrons.  
  d.   The atoms carry a positive or a negative charge.  
  Hint    
      
  18.What is the charge of an alpha particle?  
  a.   0  
  b.   1–  
  c.   1+  
  d.   2+  
  Hint    
      
  19.Which of the following statements concerning hydrogen is false?  
  a.   Hydrogen’s electron is not found in the nucleus.  
  b.   All hydrogen isotopes have one neutron.  
  c.   All hydrogen isotopes have one proton.  
  d.   All hydrogen isotopes have one electron.  
  Hint    
      
  20.What is the name of the element that has an atomic number of 3?  
  a.   lithium  
  b.   helium  
  c.   lanthanum  
  d.   beryllium  
  Hint    

 
   
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