Models Of Atoms Question Preview (ID: 257)
Glenco 6th Science Va.
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A(n) __________ is a substance that cannot be broken down into simpler substances.
a) element
b) mixture
c) metal
d) compound
What nineteenth century scientist combined the idea of elements with the Greek theory of the atom?
a) J.J. Thomson
b) Ernest Rutherford
c) Isaac Newton
d) John Dalton
A piece of metal that can conduct electricity is called a(n) __________.
a) electron
b) alpha particle
c) foil
d) electrode
How did J.J. Thomson know that the particles in the cathode-ray tube were negatively charged?
a) These particles were attracted to the negatively charged cathode, and he knew that like charges attract each other.
b) These particles were attracted to the positively charged anode, and he knew that opposite charges attract each other.
c) The particles were spread evenly throughout the tube.
d) Some of the particles went veering off at large angles to the tube.
The small, negatively charged particles discovered by J.J. Thomson are called __________.
a) electrons
b) protons
c) neutrons
d) alpha particles
Which of the following best describes Thomson's model of the atom?
a) solid ball the same throughout
b) small ball within a large shell containing empty space
c) ball of raisin-cookie dough with raisins representing electrons
d) electron cloud
Ernest Rutherford experimented with alpha particles and thin gold foil to find out __________.
a) the speed at which alpha particles travel
b) Dalton's model of the atom was correct
c) if Thomson's model of the atom was correct
d) the size of the electron orbit
Where did Rutherford propose that the positive charge in an atom was located?
a) in the outermost energy level
b) spread evenly throughout
c) moving in predictable orbits around the electrons
d) in the center
What particle in an atom is electrically neutral?
a) proton
b) neutron
c) electron
d) alpha particle
Which of the following models of the atom reflects the unpredictable motion of the electron?
a) solid ball the same throughout
b) electron cloud
c) small ball within a large shell containing empty space
d) ball of raisin-cookie dough with raisins representing electrons
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