Section 2.2 Electrons in Atoms

Practice Test
      
  1.


The distance between corresponding points on two consecutive waves is called _____________.
 
  a.   amplitude  
  b.   frequency  
  c.   speed  
  d.   wavelength  
  Hint    
      
  2.


This color of light has the highest frequency of the visible electomagnetic spectrum.
 
  a.   blue  
  b.   green  
  c.   red  
  d.   violet  
  Hint    
      
  3.An element's emission spectrum is thought to be produced when electrons move from _____________.  
  a.   higher to lower energy levels  
  b.   inside the atom to outside the atom  
  c.   lower to higher energy levels  
  d.   the nucleus to energy levels  
  Hint    
      
  4.When an atom absorbs energy that causes one of its electrons to move to a higher energy level, the atom is said to be in _____________.  
  a.   an excited state  
  b.   the ground state  
  c.   the nucleus  
  d.   an outer orbit  
  Hint    
      
  5.An atom's valence electrons are those in its ___________.  
  a.   electron clouds  
  b.   inner energy levels  
  c.   lowest energy level  
  d.   outermost energy level  
  Hint    
      
  6.A magnesium atom has _______ valence electron.  
  a.   two  
  b.   three  
  c.   four  
  d.   five  
  Hint    
      
  7.This element is in period two of the periodic table and has four dots in its Lewis dot diagram.  
  a.   carbon  
  b.   beryllium  
  c.   neon  
  d.   oxygen  
  Hint    
      
  8.The nucleus of this atom contains nine protons and nine neutrons.  
  a.   fluorine-18  
  b.   oxygen-18  
  c.   neon-18  
  d.   nitrogen-19  
  Hint    
      
  9.Lavoisier came to the conclusion that air is a mixture made up mostly of these two gases.  
  a.   nitrogen and oxygen  
  b.   oxygen and carbon dioxide  
  c.   hydrogen and oxygen  
  d.   oxygen and methane  
  Hint    
      
  10. The weighted average mass of all of an element's naturally occurring isotopes is the element's ________________.  
  a.   atomic mass  
  b.   atomic number  
  c.   mass number  
  d.   symbol  
  Hint    
      
  11.This isotope is often used to date prehistoric fossils.  
  a.   calcium-40  
  b.   carbon-14  
  c.   oxygen-16  
  d.   uranium-235  
  Hint    
      
  12.This scientist compared the the motions of electrons in atoms to the motions of planets orbiting the sun.  
  a.   Bohr  
  b.   Priestly  
  c.   Rutherford  
  d.   Thomson  
  Hint    
      
  13.


What is the frequency of yellow light , which has a wavelength of 5.56 x 10 -7 m?
 
  a.   1.85 x 10 15 Hz  
  b.   1.85 x 10 15 m/s  
  c.   5.40 x 10 14 Hz  
  d.   5.40 x 10 14 m/s  
  Hint    
      
  14.What is the wavelength of a radio wave having a frequency of 3.75 x 10 7 Hz?  
  a.   .08 m  
  b.   0.8 m  
  c.   8.0 m  
  d.   80 m  
  Hint    
      
  15.What is the maximum number of electrons that can be present in each principal energy level of hydrogen?  
  a.   n  
  b.   n 2  
  c.   2n  
  d.   2n 2  
  Hint    
      
  16.What is the wavelength of an object moving at 19.4 m/s and having a mass of 1000 kg?  
  a.   1.3 x 10 -38 m  
  b.   3.4 x 10 -38 m  
  c.   3.4 x 10 -34 m  
  d.   34 m  
  Hint    

 
   
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