Atoms

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Term
Definition
was a Greek philosopher   Democritus was  
proposed the existence of atom   Democritus did  
thought that matter can be subdivided until a single indivisible particle was reached   Democritus did  
who was an English school teacher   Dalton was  
who proposed an atomic model in the early 1800's   Dalton did  
Who thought that atoms of the same atoms were identical   Dalton did  
thought that atoms of different elements were different   Dalton did  
thought compounds formed when atoms of two or more elements combine   Dalton did  
plum pudding model   thomason's idea  
negatively charge electrons embedded in positively charged material   plum pudding model  
discovered the electron   thomason did  
discovered that the atom is basically empty space   rutherford did  
credited with the discovery of the nucleus   rutherford was  
gold foil experiment   rutherford's experiment  
used alpha particles to study structure of the atom   rutherford did  
concluded that the atom was mostly empty space with a dense positively charged nucleus in the center   rutherford did  
was danish scientist   bohr was  
proposed that the negative electrons were held in orbit by the positive nucleus   bohr did  
thought that electrons moved in definite orbits around the nucleus   bohr did  
solar system model   bohr's model  
proposed that electrons are located in energy levels   bohr did  
thought electrons were located at certain distances from the nucleus   bohr did  
wave model   modern atomic model  
wave model   proposes that electrons do not move in definite orbits  
wave model   impossible to determine exact electron location  
wave model   location of electron depends on the amount of energy the electron possesses  
proton   is a positively charged subatomic particle  
protons   are located in the nucleus  
a proton   is slightly smaller in mass than the neutron  
neutron   is the largest subatomic particle  
an electron   is negatively charged subatomic particle  
an electron   is the smallest subatomic particle  
an electron   are found in "energy cloud"  
atomic number   determines the identity of atom  
isotopes   atoms of same element that "weigh" differently  
isotopes   are atoms of the same element that differ in the number of neutrons  
mass number   number of particles in the nucleus of an atom  
mass number   is the number of protons + number of neutrons  
an electron clouds   is the space around the nucleus where electrons are found  
two electrons   is the maximum number of electrons in the first energy level  
eight electrons   is the maximum number of electrons in the second energy level  
eighteen electrons   is the maximum number of electrons in the third energy level  
thirty two electrons   maximum number of electrons in the fourth energy level  
quark   believed to makeup subatomic particles  
electromagnetic forces   force acting between charged bodies  
repulsion   is the force between two like charged bodies  
attraction   is the force between two unlike charged bodies  
strong force   is responsible for holding the nucleus together  
weak force   is responsible for the process known as radioactive decay  
protons   are positively charged subatomic particle  
Which subatomic particle is least massive?   electron is  
Which subatomic particle is most massive?   neutron is  
Almost all the mass of an atom is located where?   within thenucleus  
The atomic number of sulfur is 16. How many electrons are there in an atom of sulfur-34?   eighteen  
Atoms emit energy as light when   electrons move to a lower energy level  
Which part of Dalton's theory was modified after the discovery of isotopes?   Dalton assumed that all atoms of the same element were identical in all ways. However, they may differ in the number of neutrons present.  
What did Thomason's experiment prove?   proved that the atoms are made of even smaller particles.  
What must be true if an atom is electrically neutral?   the atom must contain within itself an equal number of electrons and protons.  
electron configuration   is the arrangement of electrons in the orbitals of the atom  
energy levels   are the possible energies that electrons in an atom can have.  
an electron cloud   is a visual model of the most likely locations for the electrons in an atom.  
the gain or lose energy may result in ______________.   an electron in an atom can from from one energy level to another  


   

 
 

 
 

 

 

 
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